Update articles/ai-services/authentication.md

Author: Jak-MS

articles/ai-services/authentication.md

@@ -257,7 +257,7 @@ In this sample, a password is used to authenticate the service principal. The to
    $accessToken = $responseToken.access_token
    ```
    >[!NOTE]
-   > Anytime you use passwords in a script, the most secure option is to use the PowerShell Secrets Management module and integrate with a solution such as Azure KeyVault
+   > Anytime you use passwords in a script, the most secure option is to use the PowerShell Secrets Management module and integrate with a solution such as Azure KeyVault.
 
    ---