Improve doc.

Change-Id: I841b04e1e455b6236fb8b65b965f2fc25c4461f0
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 5525ce3..63ad92a 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -109,9 +109,14 @@
     public PendingIntent deleteIntent;
 
     /**
-     * An intent to launch instead of posting the notification to the status bar. Only for use with
-     * extremely high-priority notifications demanding the user's attention, such as an incoming
+     * An intent to launch instead of posting the notification to the status bar.
+     * Only for use with extremely high-priority notifications demanding the user's
+     * <strong>immediate</strong>attention, such as an incoming phone call or
+     * alarm clock that the user has explicitly set to a particular time.
      * call (handled in the core Android Phone app with a full-screen Activity).
+     * If this facility is used for something else, please give the user an option
+     * to turn it off and use a normal notification, as this can be extremely
+     * disruptive.
      */
     public PendingIntent fullScreenIntent;