adding UPN

Author: khdownie

articles/storage/files/storage-files-identity-ad-ds-enable.md

@@ -162,7 +162,7 @@ The cmdlets should return the key value. Once you have the kerb1 key, create eit
 2. Modify the UPN to match the SPN for the AD object (you must have AD PowerShell cmdlets installed and execute the cmdlets in PowerShell 5.1 with elevated privileges).
 
    ```powershell
-   Set-ADUser -Identity $UserSamAccountName -UserPrincipalName
+   Set-ADUser -Identity $UserSamAccountName -UserPrincipalName cifs/<StorageAccountName>.file.core.windows.net@<UPN suffixes>
    ```
 
 3. Set the AD account password to the value of the kerb1 key.