Add TODO to target R+ for bg custom toast block

Since we'll be assessing impact on all apps first in dogfood and only
then targeting R+.

Bug: 128611929
Test: No
Change-Id: Ic37ab8a8b65163e4c955d613479d3f47238439d6

services/core/java/com/android/server/notification/NotificationManagerService.java

@@ -360,9 +360,11 @@ public class NotificationManagerService extends SystemService {
     private static final String EXTRA_KEY = "key";
 
     /**
-     * Apps targeting R+ that post custom toasts in the background will have those blocked. Apps can
+     * Apps that post custom toasts in the background will have those blocked. Apps can
      * still post toasts created with {@link Toast#makeText(Context, CharSequence, int)} and its
      * variants while in the background.
+     *
+     * TODO(b/144152069): Add @EnabledAfter(Q) to target R+ after assessing impact on dogfood
      */
     @ChangeId
     private static final long CHANGE_BACKGROUND_CUSTOM_TOAST_BLOCK = 128611929L;