Create help link placeholder for Wifi Direct settings.

Change-Id: Ia22259d191d2663d7ef63438c680826d3fd590fb
Bug: 70854725
Test: robotests

src/com/android/settings/wifi/p2p/WifiP2pSettings.java

@@ -167,6 +167,11 @@ public class WifiP2pSettings extends DashboardFragment
         return MetricsEvent.WIFI_P2P;
     }
 
+    @Override
+    public int getHelpResource() {
+        return R.string.help_url_wifi_p2p;
+    }
+
     @Override
     protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
         final List<AbstractPreferenceController> controllers = new ArrayList<>();