Clarify that up to 5 custom actions will be honored

Updating the docs to indicate the max number of custom actions that
developers can expect to be honored.

Bug: 273769279
Test: Documentation only.
Change-Id: I1a7d2ac7fff2d4dac32d46346fb86b516d8ffff2

core/java/android/content/Intent.java

@@ -5914,6 +5914,7 @@ public class Intent implements Parcelable, Cloneable {
     /**
      * A Parcelable[] of {@link ChooserAction} objects to provide the Android Sharesheet with
      * app-specific actions to be presented to the user when invoking {@link #ACTION_CHOOSER}.
+     * You can provide as many as five custom actions.
      */
     public static final String EXTRA_CHOOSER_CUSTOM_ACTIONS =
             "android.intent.extra.CHOOSER_CUSTOM_ACTIONS";