docs: tweak changelog and readme (#3796)

* docs: tweak changelog and readme

* moving to discussions :)

* Apply suggestions from code review

Co-authored-by: David Luzar <luzar.david@gmail.com>

* Add about  attributes passed to updateScene

Co-authored-by: David Luzar <luzar.david@gmail.com>

src/packages/excalidraw/CHANGELOG.md

@@ -25,16 +25,16 @@ Please add the latest change on the top under the correct section.
 
   - `localElements` argument is mandatory (can be `null`/`undefined`) if using TypeScript.
 
-- Support `appState.exportEmbedScene` attribute in [`exportToSvg`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#exportToSvg) which allows to embed the scene data.
+- Support `appState.exportEmbedScene` attribute in [`exportToSvg`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#exportToSvg) which allows to embed the scene data [#3777](https://github.com/excalidraw/excalidraw/pull/3777).
 
   #### BREAKING CHANGE
 
   - The attribute `metadata` is now removed as `metadata` was only used to embed scene data which is now supported with the `appState.exportEmbedScene` attribute.
   - [`exportToSvg`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#exportToSvg) now resolves to a promise which resolves to `svg` of the exported drawing.
 
-- Expose [`loadLibraryFromBlob`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#loadLibraryFromBlobY), [`loadFromBlob`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#loadFromBlob), and [`getFreeDrawSvgPath`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#getFreeDrawSvgPath).
+- Expose [`loadLibraryFromBlob`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#loadLibraryFromBlobY), [`loadFromBlob`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#loadFromBlob), and [`getFreeDrawSvgPath`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#getFreeDrawSvgPath) [#3764](https://github.com/excalidraw/excalidraw/pull/3764).
 
-- Expose [`FONT_FAMILY`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#FONT_FAMILY) so that consumer can use when passing `initialData.appState.currentItemFontFamily`.
+- Expose [`FONT_FAMILY`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#FONT_FAMILY) so that consumer can use when passing `initialData.appState.currentItemFontFamily` [#3710](https://github.com/excalidraw/excalidraw/pull/3710).
 
 - Added prop [`autoFocus`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#autoFocus) to focus the excalidraw component on page load when enabled, defaults to false [#3691](https://github.com/excalidraw/excalidraw/pull/3691).
 
@@ -47,10 +47,10 @@ Please add the latest change on the top under the correct section.
 
   Also, [`UIOptions`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#UIOptions) is now memoized to avoid unnecessary rerenders.
 
-#### BREAKING CHANGE
+  #### BREAKING CHANGE
 
-- `UIOptions.canvasActions.saveAsScene` is now renamed to `UiOptions.canvasActions.export.saveFileToDisk`. Defaults to `true` hence the **save file to disk** button is rendered inside the export dialog.
-- `exportToBackend` is now renamed to `UIOptions.canvasActions.export.exportToBackend`. If this prop is not passed, the **shareable-link** button will not be rendered, same as before.
+  - `UIOptions.canvasActions.saveAsScene` is now renamed to `UiOptions.canvasActions.export.saveFileToDisk`. Defaults to `true` hence the **save file to disk** button is rendered inside the export dialog.
+  - `exportToBackend` is now renamed to `UIOptions.canvasActions.export.exportToBackend`. If this prop is not passed, the **shareable-link** button will not be rendered, same as before.
 
 ### Fixes
 
@@ -63,8 +63,6 @@ Please add the latest change on the top under the correct section.
   - Removed `shouldAddWatermark: boolean` attribute from options for [export](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#export-utilities) APIs [#3639](https://github.com/excalidraw/excalidraw/pull/3639).
   - Removed `appState.shouldAddWatermark` so in case you were passing `shouldAddWatermark` in [initialData.AppState](https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L42) it will not work anymore.
 
----
-
 ## 0.8.0 (2021-05-15)
 
 ## Excalidraw API

src/packages/excalidraw/README_NEXT.md

@@ -359,7 +359,7 @@ To view the full example visit :point_down:
 | --- | --- | --- | --- |
 | [`onChange`](#onChange) | Function |  | This callback is triggered whenever the component updates due to any change. This callback will receive the excalidraw elements and the current app state. |
 | [`initialData`](#initialData) | <pre>{elements?: <a href="https://github.com/excalidraw/excalidraw/blob/master/src/element/types.ts#L78">ExcalidrawElement[]</a>, appState?: <a href="https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L42">AppState<a> } </pre> | null | The initial data with which app loads. |
-| [`ref`](#ref) | [`createRef`](https://reactjs.org/docs/refs-and-the-dom.html#creating-refs) or [`callbackRef`](https://reactjs.org/docs/refs-and-the-dom.html#callback-refs) or <pre>{ current: { readyPromise: <a href="https://github.com/excalidraw/excalidraw/blob/master/src/utils.ts#L317">resolvablePromise</a> } }</pre> |  | Ref to be passed to Excalidraw |
+| [`ref`](#ref) | [`createRef`](https://reactjs.org/docs/refs-and-the-dom.html#creating-refs) &#124; [`useRef`](https://reactjs.org/docs/hooks-reference.html#useref) &#124; [`callbackRef`](https://reactjs.org/docs/refs-and-the-dom.html#callback-refs) &#124; <pre>{ current: { readyPromise: <a href="https://github.com/excalidraw/excalidraw/blob/master/src/utils.ts#L317">resolvablePromise</a> } }</pre> |  | Ref to be passed to Excalidraw |
 | [`onCollabButtonClick`](#onCollabButtonClick) | Function |  | Callback to be triggered when the collab button is clicked |
 | [`isCollaborating`](#isCollaborating) | `boolean` |  | This implies if the app is in collaboration mode |
 | [`onPointerUpdate`](#onPointerUpdate) | Function |  | Callback triggered when mouse pointer is updated. |
@@ -448,7 +448,7 @@ You can pass a `ref` when you want to access some excalidraw APIs. We expose the
 | --- | --- | --- |
 | ready | `boolean` | This is set to true once Excalidraw is rendered |
 | readyPromise | [resolvablePromise](https://github.com/excalidraw/excalidraw/blob/master/src/utils.ts#L317) | This promise will be resolved with the api once excalidraw has rendered. This will be helpful when you want do some action on the host app once this promise resolves. For this to work you will have to pass ref as shown [here](#readyPromise) |
-| updateScene | <pre>(<a href="https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L204">sceneData</a>)) => void </pre> | updates the scene with the sceneData |
+| [updateScene](#updateScene) | <pre>(<a href="https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L207">sceneData</a>)) => void </pre> | updates the scene with the sceneData |
 | resetScene | `({ resetLoadingState: boolean }) => void` | Resets the scene. If `resetLoadingState` is passed as true then it will also force set the loading state to false. |
 | getSceneElementsIncludingDeleted | <pre> () => <a href="https://github.com/excalidraw/excalidraw/blob/master/src/element/types.ts#L78">ExcalidrawElement[]</a></pre> | Returns all the elements including the deleted in the scene |
 | getSceneElements | <pre> () => <a href="https://github.com/excalidraw/excalidraw/blob/master/src/element/types.ts#L78">ExcalidrawElement[]</a></pre> | Returns all the elements excluding the deleted in the scene |
@@ -466,6 +466,23 @@ You can pass a `ref` when you want to access some excalidraw APIs. We expose the
 const excalidrawRef = { current: { readyPromise: <a href="https://github.com/excalidraw/excalidraw/blob/master/src/utils.ts#L317">resolvablePromise</a>}}
 </pre>
 
+Since plain object is passed as a `ref`, the `readyPromise` is resolved as soon as the component is mounted. Most of the time you will not need this unless you have a specific use case where you can't pass the `ref` in the react way and want to do some action on the host when this promise resolves. You can check the [example](https://codesandbox.io/s/eexcalidraw-resolvable-promise-d0qg3?file=/src/App.js) for the usage.
+
+### `updateScene`
+
+<pre>
+(<a href="https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L207">sceneData</a>)) => void
+</pre>
+
+You can use this function to update the scene with the sceneData. It accepts the below attributes.
+
+| Name | Type | Description |
+| --- | --- | --- |
+| `elements` | [`ImportedDataState["elements"]`](https://github.com/excalidraw/excalidraw/blob/master/src/data/types.ts#L17) | The `elements` to be updated in the scene |
+| `appState` | [`ImportedDataState["appState"]`](https://github.com/excalidraw/excalidraw/blob/master/src/data/types.ts#L18) | The `appState` to be updated in the scene. |
+| `collaborators` | <pre>Map<string, <a href="https://github.com/excalidraw/excalidraw/blob/master/src/types.ts#L29">Collaborator></a></pre> | The list of collaborators to be updated in the scene. |
+| `commitToHistory` | `boolean` | Implies if the `history (undo/redo)` should be recorded. Defaults to `false`. |
+
 #### `onCollabButtonClick`
 
 This callback is triggered when clicked on the collab button in excalidraw. If not supplied, the collab dialog button is not rendered.
@@ -597,7 +614,7 @@ In case you want to prevent the excalidraw paste action you must return `true`,
 
 ### Does it support collaboration ?
 
-No Excalidraw package doesn't come with collaboration, since this would have different implementations on the consumer so we expose the API's which you can use to communicate with Excalidraw as mentioned above. If you are interested in understanding how Excalidraw does it you can check it [here](https://github.com/excalidraw/excalidraw/blob/master/src/excalidraw-app/index.tsx).
+No, Excalidraw package doesn't come with collaboration built in, since the implementation is specific to each host app. We expose APIs which you can use to communicate with Excalidraw which you can use to implement it. You can check our own implementation [here](https://github.com/excalidraw/excalidraw/blob/master/src/excalidraw-app/index.tsx).
 
 ### importLibrary
 
@@ -910,3 +927,7 @@ getFreeDrawSvgPath(element: <a href="https://github.com/excalidraw/excalidraw/bl
 </pre>
 
 This function returns the free draw svg path for the element.
+
+## Need help?
+
+Check out the existing [Q&A](https://github.com/excalidraw/excalidraw/discussions?discussions_q=label%3Apackage%3Aexcalidraw). If you have any queries or need help, ask us [here](https://github.com/excalidraw/excalidraw/discussions?discussions_q=label%3Apackage%3Aexcalidraw).