update network security card name

Author: duongau

articles/networking/hybrid-connectivity/index.yml

@@ -23,7 +23,7 @@ highlightedContent:
     - title: Azure Networking blogs
       itemType: concept
       url: https://azure.microsoft.com/en-us/blog/?s=&k%5B0%5D=Virtual%20WAN&k%5B1%5D=ExpressRoute&k%5B2%5D=VPN
-    - title: Azure network security
+    - title: Azure network security documentation
       itemType: overview
       url: ../security/index.yml
     - title: Hub-spoke network topology in Azure