added author metadata to group policy doc to be deleted

Author: johnmarco

articles/azure-arc/servers/onboard-group-policy.md

@@ -4,6 +4,7 @@ description: In this article, you learn how to connect machines to Azure using A
 ms.date: 10/20/2022
 ms.topic: conceptual
 ms.custom: template-how-to
+author: johnmarco
 ---
 
 # Connect machines at scale using Group Policy