Update azure-kubernetes-service-backup-troubleshoot.md

Author: rajats22

articles/backup/azure-kubernetes-service-backup-troubleshoot.md

@@ -349,7 +349,7 @@ These error codes can appear while you enable AKS backup to store backups in a v
 
 **Cause**: To perform a restore operation, user needs to have a **read** permission over the backed up AKS cluster. 
 
-**Recommended action**: Assign Reader role over the source AKS cluster and then proceed to perform the restore operation. 
+**Recommended action**: Assign Reader role on the source AKS cluster and then proceed to perform the restore operation. 
 
 ## Next steps