typo: notificaton -> notification

Author: nschonni

articles/notification-hubs/notification-hubs-android-push-notification-google-gcm-get-started.md

@@ -52,7 +52,7 @@ In this tutorial, you do the following actions:
 
 ### Configure GCM setting for the notification hub
 
-1. Select **Google (GCM)** in **NOTIFICATON SETTINGS**. 
+1. Select **Google (GCM)** in **NOTIFICATION SETTINGS**. 
 2. Enter **API Key** you got from the Google Cloud Console. 
 3. Select **Save** on the toolbar.