Add syncToken to Event Grid data

Author: avanigupta

articles/azure-app-configuration/howto-app-configuration-event.md

@@ -111,7 +111,8 @@ You've triggered the event, and Event Grid sent the message to the endpoint you
   "subject": "https://{appconfig-name}.azconfig.io/kv/Foo",
   "data": {
     "key": "Foo",
-    "etag": "a1LIDdNEIV6wCnfv3xaip7fMXD3"
+    "etag": "a1LIDdNEIV6wCnfv3xaip7fMXD3",
+    "syncToken":"zAJw6V16=Njo1IzMzMjE3MzA=;sn=3321730"
   },
   "eventType": "Microsoft.AppConfiguration.KeyValueModified",
   "eventTime": "2019-05-31T18:59:54Z",