Remove Using - MicrosoftDocs/azure-docs#47866

Removing the using reference for Microsoft.Azure.Services.AppAuthentication. MicrosoftDocs/azure-docs#47866

Author: MonikaReddy-MSFT

articles/azure-app-configuration/howto-integrate-azure-managed-service-identity.md

@@ -92,7 +92,6 @@ To set up a managed identity in the portal, you first create an application and
 
     ```csharp-interactive
     using Azure.Identity;
-    using Microsoft.Azure.Services.AppAuthentication;
     ```
 
 1. If you wish to access only values stored directly in App Configuration, update the `CreateWebHostBuilder` method by replacing the `config.AddAzureAppConfiguration()` method.
@@ -259,4 +258,4 @@ For example, you can update the .NET Framework console app created in the quicks
 In this tutorial, you added an Azure managed identity to streamline access to App Configuration and improve credential management for your app. To learn more about how to use App Configuration, continue to the Azure CLI samples.
 
 > [!div class="nextstepaction"]
-> [CLI samples](./cli-samples.md)
+> [CLI samples](./cli-samples.md)