Update overview.md

Author: paweenatongbai

articles/cloud-shell/overview.md

@@ -9,7 +9,6 @@ tags: azure-resource-manager
 
 ms.assetid: 
 ms.service: azure
-ms.subservice: cloud-shell
 ms.workload: infrastructure-services
 ms.tgt_pltfrm: vm-linux
 ms.topic: article