Update network-best-practices.md

Fixing ms.service
-------
cc: @TerryLanfear

Author: cynthn

articles/security/fundamentals/network-best-practices.md

@@ -1,14 +1,12 @@
 ---
 title: Best practices for network security - Microsoft Azure
 description: This article provides a set of best practices for network security using built in Azure capabilities.
-services: security
 author: TerryLanfear
 manager: barbkess
 editor: TomShinder
 
 ms.assetid: 7f6aa45f-138f-4fde-a611-aaf7e8fe56d1
-ms.service: virtual-machines
-ms.subservice: security
+ms.service: security
 ms.topic: article
 ms.tgt_pltfrm: na
 ms.workload: na