Update flexible-virtual-machine-scale-sets-cli.md

Author: rayoef

articles/virtual-machine-scale-sets/flexible-virtual-machine-scale-sets-cli.md

@@ -837,7 +837,7 @@ The following command shows you the public IP of your Application Gateway. Paste
 az network public-ip show --resource-group $MY_RESOURCE_GROUP_NAME --name $MY_APPGW_PUBLIC_IP_NAME --query [ipAddress]  --output tsv
 ```
 
-## Clean up resources
+## Clean up resources (optional)
 
 To avoid Azure charges, you should clean up unneeded resources. When you no longer need your scale set and other resources, delete the resource group and all its resources with [az group delete](/cli/azure/group). The `--no-wait` parameter returns control to the prompt without waiting for the operation to complete. The `--yes` parameter confirms that you wish to delete the resources without another prompt to do so. This tutorial cleans up resources for you.