update title name

Author: duongau

articles/networking/index.yml

@@ -23,7 +23,7 @@ highlightedContent:
     - title: What's new in Azure Networking? 
       itemType: whats-new 
       url: https://azure.microsoft.com/updates/?category=networking
-    - title: Azure network security
+    - title: Azure network security documentation
       itemType: overview
       url: ./security/index.yml
     - title: Hub-spoke network topology in Azure
@@ -251,4 +251,4 @@ additionalContent:
             - text: Secure your virtual WAN using Azure Firewall Manager
               url: ../firewall-manager/secure-cloud-network.md
             - text: See more
-              url: ../firewall-manager/index.yml
+              url: ../firewall-manager/index.yml