Add Indonesia Central to Azure Files Pv2 list.

Author: wmgries

articles/storage/files/understanding-billing.md

@@ -145,6 +145,7 @@ Currently, these SKUs are generally available in a limited subset of regions:
 - Spain Central
 - New Zealand North
 - Italy North
+- Indonesia Central
 
 Storage accounts in regions flagged with an asterisk (*) can only be created using Azure PowerShell or Azure CLI. See [create a storage account](./storage-how-to-create-file-share.md) for more information.