Update GET_UNINSTALLED_PACKAGES flag documentation

Change-Id: I483b84f07836e6ad96c75e7dd3a86633cb29db22
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 3eb7647..8541748d 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -153,10 +153,14 @@
     public static final int GET_PERMISSIONS               = 0x00001000;
 
     /**
-     * Flag parameter to retrieve all applications(even uninstalled ones) with data directories.
-     * This state could have resulted if applications have been deleted with flag
-     * DONT_DELETE_DATA
-     * with a possibility of being replaced or reinstalled in future
+     * Flag parameter to retrieve some information about all applications (even
+     * uninstalled ones) which have data directories. This state could have
+     * resulted if applications have been deleted with flag
+     * {@code DONT_DELETE_DATA} with a possibility of being replaced or
+     * reinstalled in future.
+     * <p>
+     * Note: this flag may cause less information about currently installed
+     * applications to be returned.
      */
     public static final int GET_UNINSTALLED_PACKAGES = 0x00002000;