Add javadoc for Notification.getAllowSystemGeneratedContextualActions()

Bug: 121188848
Test: N/A
Change-Id: I66c3403fb55833494572fc5d85073a631c8212fb
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index b9d5907..e066f06 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -3130,6 +3130,10 @@
         return mAppOverlayIntent;
     }
 
+    /**
+     * Returns whether the platform is allowed (by the app developer) to generate contextual actions
+     * for this notification.
+     */
     public boolean getAllowSystemGeneratedContextualActions() {
         return mAllowSystemGeneratedContextualActions;
     }