Update index.yml

capitalization fix

Author: v-albemi

articles/notification-hubs/index.yml

@@ -68,7 +68,7 @@ landingContent:
     linkLists:
       - linkListType: sample
         links:
-          - text: Azure Notification Hubs Samples
+          - text: Azure Notification Hubs samples
             url: samples.md
           - text: PowerShell samples
             url: samples-powershell.md
@@ -95,4 +95,4 @@ landingContent:
           - text: Support options
             url: https://azure.microsoft.com/support/options/
           - text: MSDN forums
-            url: https://social.msdn.microsoft.com/Forums/azure/en-US/home?forum=notificationhubs
+            url: https://social.msdn.microsoft.com/Forums/azure/en-US/home?forum=notificationhubs