Update infrastructure-network.md

Author: cynthn

articles/security/fundamentals/infrastructure-network.md

@@ -8,7 +8,7 @@ manager: rkarlin
 
 ms.assetid: 61e95a87-39c5-48f5-aee6-6f90ddcd336e
 ms.service: security
-ms.subservice: networking
+ms.subservice: security-fundamentals
 ms.topic: article
 ms.tgt_pltfrm: na
 ms.workload: na