add regions

Author: b-ahibbard

articles/azure-netapp-files/whats-new.md

@@ -17,6 +17,8 @@ Azure NetApp Files is updated regularly. This article provides a summary about t
 * [Edit network features enhancement: no downtime](configure-network-features.md#no-downtime)
 
     Azure NetApp Files now supports the ability to edit network features -- that is, upgrade from Basic to Standard network features -- with no downtime for Azure NetApp Files volumes. Standard Network Features provide you with an enhanced virtual networking experience for a seamless and consistent experience along with security posture for Azure NetApp Files. 
+
+    This feature is currently in preview in the Austria East, Central India, North Central US, and Switzerland North regions. 
 
 ## September 2024