Fixing build warning due to duplicate metadata.

Author: JasonWHowell

articles/azure-app-configuration/howto-labels-aspnet-core.md

@@ -4,8 +4,6 @@ titleSuffix: Azure App Configuration
 description: Use labels to provide per-environment configuration values
 ms.service: azure-app-configuration
 author: lisaguthrie
-
-ms.service: azure-app-configuration
 ms.topic: conceptual
 ms.date: 3/12/2020
 ms.author: lcozzens
@@ -82,4 +80,4 @@ Now update `launchSettings.json` to set the `ASPNETCORE_ENVIRONMENT` variable to
 ## Next steps
 
 > [!div class="nextstepaction"]
-> [Configuration in ASP.NET Core](/aspnet/core/fundamentals/configuration/)
+> [Configuration in ASP.NET Core](/aspnet/core/fundamentals/configuration/)