Unhide Settings.ACTION_BATTERY_SAVER_SETTINGS.

Bug: 18186862
Change-Id: I685934118a53ba2135eaf0872564e58069de2a30
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index c091d25..369efac 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -872,8 +872,9 @@
 
     /**
      * Activity Action: Show battery saver settings.
-     *
-     * @hide
+     * <p>
+     * In some cases, a matching Activity may not exist, so ensure you safeguard
+     * against this.
      */
     @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
     public static final String ACTION_BATTERY_SAVER_SETTINGS