Fix javadoc for Context.TETHERING_SERVICE

Users of the API receive a TetheringManager from getSystemService; they
do not call ServiceManager.getService.

Bug: 151243982
Test: m
(clean cherry-pick from internal branch)
Merged-In: If75f590da17f07ea9d65635065689d8f4e17b40f

Change-Id: I129ffa7abae1218bcf88ccb8ba074ec8ad50119b

core/java/android/content/Context.java

@@ -3867,10 +3867,10 @@ public abstract class Context {
     public static final String NETWORK_STACK_SERVICE = "network_stack";
 
     /**
-     * Use with {@link android.os.ServiceManager.getService()} to retrieve a
-     * {@link ITetheringConnector} IBinder for communicating with the tethering service
+     * Use with {@link #getSystemService(String)} to retrieve a {@link android.net.TetheringManager}
+     * for managing tethering functions.
      * @hide
-     * @see TetheringClient
+     * @see android.net.TetheringManager
      */
     @SystemApi
     public static final String TETHERING_SERVICE = "tethering";