Fix links to Code of Conduct (#17732)

Author: Immo Landwerth

README.md

@@ -5,8 +5,3 @@ This repository contains the conceptual ASP.NET Core documentation hosted at [do
 API documentation changes are made in the [AspNetApiDocs repository](https://github.com/dotnet/AspNetApiDocs) against the triple slash `///` comments.
 
 ASP.NET 4.x documentation changes are made in the [dotnet/AspNetDocs repository](https://github.com/dotnet/AspNetDocs).
-
-## Microsoft Open Source Code of Conduct
-
-This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
-For more information, see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.