Update azure-hybrid-benefit-linux.md

Explained a bit more the model to change from BYOS to PAYG as "none" value is not for all the systems and customers are following it.

Author: mitchcr

articles/virtual-machines/linux/azure-hybrid-benefit-linux.md

@@ -122,13 +122,15 @@ az vm update -g myResourceGroup -n myVmName --license-type SLES_BYOS
 
 #### Convert to PAYG using the Azure CLI
 
-To return a VM to a PAYG model, use a `--license-type` value of `None`:
+If the system was originally a PAYG image and customer wants to return the VM to a PAYG model, use a `--license-type` value of `None` as shows the example below:
 
 ```azurecli
 # This will enable PAYG on a virtual machine using Azure Hybrid Benefit
 az vm update -g myResourceGroup -n myVmName --license-type None
 ```
 
+But if customer has a BYOS and wants to convert the VM to PAYG, use a `--license-type` value that covers the VM needs, those codes are described below in the document, for example for RHEL systems it could be any of the following:  RHEL_BASE, RHEL_EUS, RHEL_SAPAPPS, RHEL_SAPHA, RHEL_BASEAPAPPS or RHEL_BASESAPHA. 
+
 #### Convert multiple VM license models simultaneously using the Azure CLI
 
 To switch the licensing model on a large number of virtual machines, you can use the `--ids` parameter in the Azure CLI: