Update concepts.md

Author: kperla97

articles/communication-services/concepts/chat/concepts.md

@@ -2,7 +2,7 @@
 title: Chat concepts in Azure Communication Services
 titleSuffix: An Azure Communication Services concept document
 description: Learn about Communication Services Chat concepts.
-author: kaperla
+author: kperla97
 manager: sundraman
 services: azure-communication-services
 ms.author: chpalm