Update file name

Author: azhar2005

articles/application-gateway/classic-to-resource-manager.md

@@ -40,7 +40,7 @@ Azure Resource Manager is the latest control plane of Azure responsible for crea
 
 ### Where can I find more information regarding classic to Azure Resource Manager migration?
 
-Please refer to [Frequently asked questions about classic to Azure Resource Manager migration](../virtual-machines/migration-classic-resource-manager-faq.md)
+Please refer to [Frequently asked questions about classic to Azure Resource Manager migration](../virtual-machines/migration-classic-resource-manager-faq.yml)
 
 ### How do I report an issue?