Phrasing

Author: roygara

articles/storage/files/storage-files-identity-auth-active-directory-enable.md

@@ -57,7 +57,7 @@ Before you enable AD authentication for Azure file shares, make sure you have co
 
 ## Regional availability
 
-Azure Files AD authentication (preview) is available in [most public regions](https://azure.microsoft.com/global-infrastructure/regions/) except:
+Azure Files AD authentication (preview) is available in [most public regions](https://azure.microsoft.com/global-infrastructure/regions/) except for:
 
 - West US
 - West US 2