updated changelog

Author: Sambit Rath

src/RecoveryServices/RecoveryServices/ChangeLog.md

@@ -23,6 +23,7 @@
 * Azure Backup added support for retrying policy update for failed items.
 * Azure Backup Added support for disk exclusion settings during backup and restore.
 * Azure Backup Added Support for Restoring Multiple files/folders in AzureFileShare
+* Azure Backup Added support for User-specified Resourcegroup support while updating IaasVM Policy
 
 ## Version 2.7.0
 * Added Support for Restore-as-files for SQL Databases.