refactor: make accessibilitySupportEnabled a property on app (#17362)

* refactor: make accessibilitySupport a prop on app

* fix docs

* update spec

docs/api/app.md

@@ -1150,6 +1150,8 @@ technologies, such as screen readers, has been detected. See
 https://www.chromium.org/developers/design-documents/accessibility for more
 details.
 
+**[Deprecated Soon](modernization/property-updates.md)**
+
 ### `app.setAccessibilitySupportEnabled(enabled)` _macOS_ _Windows_
 
 * `enabled` Boolean - Enable or disable [accessibility tree](https://developers.google.com/web/fundamentals/accessibility/semantics-builtin/the-accessibility-tree) rendering
@@ -1161,6 +1163,8 @@ This API must be called after the `ready` event is emitted.
 
 **Note:** Rendering accessibility tree can significantly affect the performance of your app. It should not be enabled by default.
 
+**[Deprecated Soon](modernization/property-updates.md)**
+
 ### `app.showAboutPanel` _macOS_ _Linux_
 
 Show the app's about panel options. These options can be overridden with `app.setAboutPanelOptions(options)`.
@@ -1337,6 +1341,16 @@ Sets the `image` associated with this dock icon.
 A `Menu` property that return [`Menu`](menu.md) if one has been set and `null` otherwise.
 Users can pass a [Menu](menu.md) to set this property.
 
+### `app.accessibilitySupportEnabled` _macOS_ _Windows_
+
+A `Boolean` property that's `true` if Chrome's accessibility support is enabled, `false` otherwise. This property will be `true` if the use of assistive technologies, such as screen readers, has been detected. Setting this property to `true` manually enables Chrome's accessibility support, allowing developers to expose accessibility switch to users in application settings.
+
+See [Chromium's accessibility docs](https://www.chromium.org/developers/design-documents/accessibility) for more details. Disabled by default.
+
+This API must be called after the `ready` event is emitted.
+
+**Note:** Rendering accessibility tree can significantly affect the performance of your app. It should not be enabled by default.
+
 ### `app.isPackaged`
 
 A `Boolean` property that returns  `true` if the app is packaged, `false` otherwise. For many apps, this property can be used to distinguish development and production environments.

docs/api/modernization/property-updates.md

@@ -5,9 +5,7 @@ The Electron team is currently undergoing an initiative to convert separate gett
 ## Candidates
 
 * `app` module
-  * `accessibilitySupport`
   * `badgeCount`
-  * `applicationMenu`
   * `name`
   * `dock`
     * `badge`
@@ -56,3 +54,7 @@ The Electron team is currently undergoing an initiative to convert separate gett
   * `audioMuted`
 
 ## Converted Properties
+
+* `app` module
+  * `accessibilitySupport`
+  * `applicationMenu`