Improve some javadoc related to isProviderEnabled() apis

- LocationManager.isProviderEnabled() no longer throws SecurityException:
the caller could already circumvent the permission check by calling
Secure.isLocationProviderEnabled()

Change-Id: I5abd04264299671ed35ce4594b5be46d86378767
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 1a80818..6786d49 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -3333,7 +3333,9 @@
          */
         public static final int LOCATION_MODE_SENSORS_ONLY = 1;
         /**
-         * Reduced power usage, such as limiting the number of GPS updates per hour.
+         * Reduced power usage, such as limiting the number of GPS updates per hour. Requests
+         * with {@link android.location.Criteria#POWER_HIGH} may be downgraded to
+         * {@link android.location.Criteria#POWER_MEDIUM}.
          */
         public static final int LOCATION_MODE_BATTERY_SAVING = 2;
         /**
@@ -4382,10 +4384,13 @@
 
         /**
          * Helper method for determining if a location provider is enabled.
+         *
          * @param cr the content resolver to use
          * @param provider the location provider to query
          * @return true if the provider is enabled
-         * @deprecated use {@link #getInt(ContentResolver, String)} and {@link #LOCATION_MODE}
+         *
+         * @deprecated use {@link #LOCATION_MODE} or
+         *             {@link LocationManager#isProviderEnabled(String)}
          */
         @Deprecated
         public static final boolean isLocationProviderEnabled(ContentResolver cr, String provider) {
@@ -4398,8 +4403,8 @@
          * @param provider the location provider to query
          * @param userId the userId to query
          * @return true if the provider is enabled
-         * @deprecated use {@link #getIntForUser(ContentResolver, String, int, int)} and
-         *             {@link #LOCATION_MODE}
+         * @deprecated use {@link #LOCATION_MODE} or
+         *             {@link LocationManager#isProviderEnabled(String)}
          * @hide
          */
         @Deprecated