Add help url for remote display.

Bug: 11736504
Change-Id: I83d278731cf853ff911ff1a8b82a942881cb4727

src/com/android/settings/wfd/WifiDisplaySettings.java

@@ -136,6 +136,11 @@ public final class WifiDisplaySettings extends SettingsPreferenceFragment {
         setHasOptionsMenu(true);
     }
 
+    @Override
+    protected int getHelpResource() {
+        return R.string.help_url_remote_display;
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);