update: iOS accessibility tree sync improvement (JetBrains#324)

Describing EAP changes from JetBrains/compose-multiplatform-core#1780

Author: zamulla

topics/compose/ios/compose-ios-accessibility.md

@@ -27,6 +27,11 @@ You can customize these settings with the new Compose Multiplatform API.
 
 ### Choose the tree synchronization option
 
+> In Compose Multiplatform %composeEapVersion%, [this option has been removed](whats-new-compose-180.md#loading-accessibility-tree-on-demand)
+> as the accessibility tree is synchronized lazily and no longer requires additional configuration.
+>
+{style="tip"}
+
 To debug and test events and interactions, you can change the synchronization mode to:
 * Never synchronize the tree with UI, for example, to temporarily disable accessibility mapping.
 * Always synchronize the tree so that it is rewritten every time the UI updates to test the accessibility integration thoroughly.

topics/whats-new/whats-new-compose-180.md

@@ -127,6 +127,19 @@ see the [dedicated article](https://developer.android.com/develop/ui/compose/tou
 Compose Multiplatform %composeEapVersion% introduces accessibility support for right-to-left languages,
 including proper text direction handling for gestures.
 
+#### Loading accessibility tree on demand
+
+Instead of setting a specific mode of syncing the Compose semantic tree with the iOS accessibility tree,
+you can now rely on Compose Multiplatform to handle this process lazily:
+the tree is fully loaded after the first request from the iOS accessibility engine
+and is disposed of when the screen reader stops interacting with it.
+
+This allows fully supporting iOS Voice Control, VoiceOver,
+and other accessibility tools that rely on the accessibility tree.
+
+The `AccessibilitySyncOptions` class, which was [used to configure accessibility tree sync](compose-ios-accessibility.md#choose-the-tree-synchronization-option),
+has been removed as it is no longer necessary.
+
 #### Accessibility for scrollable lists
 
 This version improves the performance and accuracy of scrolling boundary and element position calculations.