Document AccessibilityManager high contrast listener (#583)

* Document high contrast text listener

Refs #246

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Add Android attribution

Refs #246

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: jonathanpeppers

docs/xml/Android.Views.Accessibility/AccessibilityManager.xml

@@ -493,10 +493,22 @@
         <Parameter Name="listener" Type="Android.Views.Accessibility.AccessibilityManager+IHighContrastTextStateChangeListener" Index="1" FrameworkAlternate="net-android-36.0" />
       </Parameters>
       <Docs>
-        <param name="executor">To be added.</param>
-        <param name="listener">To be added.</param>
-        <summary>To be added.</summary>
-        <remarks>To be added.</remarks>
+        <param name="executor">The executor through which callback and listener events are dispatched.</param>
+        <param name="listener">The listener to notify.</param>
+        <summary>Registers a listener for changes in the system high contrast text state.</summary>
+        <remarks>
+          <para>
+            <format type="text/html">
+              <a href="https://developer.android.com/reference/android/view/accessibility/AccessibilityManager#addHighContrastTextStateChangeListener(java.util.concurrent.Executor,%20android.view.accessibility.AccessibilityManager.HighContrastTextStateChangeListener)" title="Reference documentation">Java documentation for <code>android.view.accessibility.AccessibilityManager.addHighContrastTextStateChangeListener(java.util.concurrent.Executor, android.view.accessibility.AccessibilityManager.HighContrastTextStateChangeListener)</code>.</a>
+            </format>
+          </para>
+          <para>
+            Portions of this page are modifications based on work created and shared by the
+            <format type="text/html"><a href="https://developers.google.com/terms/site-policies" title="Android Open Source Project">Android Open Source Project</a></format>
+            and used according to terms described in the
+            <format type="text/html"><a href="https://creativecommons.org/licenses/by/2.5/" title="Creative Commons 2.5 Attribution License">Creative Commons 2.5 Attribution License.</a></format>
+          </para>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="AddTouchExplorationStateChangeListener">