Remove iOS flag from scrollEventThrottle prop (facebook#35840)

Summary:
The `scrollEventThrottle` prop is documented as only applying to iOS, but in [this commit](facebook@cf55fd5) it was also implemented for Android, but the documentation was not updated.

## Changelog
[GENERAL] [CHANGED] - Removed iOS flag from `scrollEventThrottle` docs
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Pull Request resolved: facebook#35840

Test Plan: I've not been able to find how to build the docs locally, so I don't have a screenshot of the changes :(

Reviewed By: cipolleschi

Differential Revision: D42530943

Pulled By: sammy-SC

fbshipit-source-id: 2948eca2621712ccd832f4f99f1aab0cbd4af2d0

Author: robwalkerco

Libraries/Components/ScrollView/ScrollView.js

@@ -310,24 +310,6 @@ type IOSProps = $ReadOnly<{|
    * @platform ios
    */
   pinchGestureEnabled?: ?boolean,
-  /**
-   * This controls how often the scroll event will be fired while scrolling
-   * (as a time interval in ms). A lower number yields better accuracy for code
-   * that is tracking the scroll position, but can lead to scroll performance
-   * problems due to the volume of information being send over the bridge.
-   *
-   * Values between 0 and 17ms indicate 60fps updates are needed and throttling
-   * will be disabled.
-   *
-   * If you do not need precise scroll position tracking, set this value higher
-   * to limit the information being sent across the bridge.
-   *
-   * The default value is zero, which results in the scroll event being sent only
-   * once each time the view is scrolled.
-   *
-   * @platform ios
-   */
-  scrollEventThrottle?: ?number,
   /**
    * The amount by which the scroll view indicators are inset from the edges
    * of the scroll view. This should normally be set to the same value as
@@ -569,14 +551,29 @@ export type Props = $ReadOnly<{|
    * Note: Vertical pagination is not supported on Android.
    */
   pagingEnabled?: ?boolean,
-
   /**
    * When false, the view cannot be scrolled via touch interaction.
    * The default value is true.
    *
    * Note that the view can always be scrolled by calling `scrollTo`.
    */
   scrollEnabled?: ?boolean,
+  /**
+   * This controls how often the scroll event will be fired while scrolling
+   * (as a time interval in ms). A lower number yields better accuracy for code
+   * that is tracking the scroll position, but can lead to scroll performance
+   * problems due to the volume of information being send over the bridge.
+   *
+   * Values between 0 and 17ms indicate 60fps updates are needed and throttling
+   * will be disabled.
+   *
+   * If you do not need precise scroll position tracking, set this value higher
+   * to limit the information being sent across the bridge.
+   *
+   * The default value is zero, which results in the scroll event being sent only
+   * once each time the view is scrolled.
+   */
+  scrollEventThrottle?: ?number,
   /**
    * When true, shows a vertical scroll indicator.
    * The default value is true.