Merge pull request #1353 from firebase/am-messaging_comment

Update description for RequestPermissionAsync

Author: a-maurice

messaging/testapp/Assets/Firebase/Sample/Messaging/UIHandler.cs

@@ -82,10 +82,12 @@ void InitializeFirebase() {
 });
 DebugLog("Firebase Messaging Initialized");
 
-// This will display the prompt to request permission to receive
+// On iOS, this will display the prompt to request permission to receive
 // notifications if the prompt has not already been displayed before. (If
 // the user already responded to the prompt, thier decision is cached by
 // the OS and can be changed in the OS settings).
+// On Android, this will return successfully immediately, as there is no
+// equivalent system logic to run.
 Firebase.Messaging.FirebaseMessaging.RequestPermissionAsync().ContinueWithOnMainThread(
 task => {
 LogTaskCompletion(task, "RequestPermissionAsync");