direct issues to this repo (#1132)

* direct issues to this repo

We moved API issues to this repository to facilitate better management.

* include the note for the samples repo label

README.md

@@ -3,6 +3,6 @@
 This repo contains documentation for the .NET API Reference.
 
 The main repository for .NET documentation is the [.NET Docs repository](https://github.com/dotnet/docs). See the [Contributing Guide](https://github.com/dotnet/docs/blob/master/CONTRIBUTING.md) for information on updating .NET API reference documentation.
-We are tracking all work for this repository using [.NET Docs repository issues](https://github.com/dotnet/docs/issues). You can select the [Repo - dotnet-api-docs](https://github.com/dotnet/docs/issues?q=is%3Aopen+is%3Aissue+label%3A%22%3Afile_folder%3A+Repo+-+dotnet-api-docs%222) label to see issues that are scoped to this repository. You can also select the [Repo - samples](https://github.com/dotnet/docs/issues?q=is%3Aopen+is%3Aissue+label%3A%22%3Afile_folder%3A+Repo+-+samples%22) label to see issues that concern sample code.
+We are tracking all work for this repository using [GitHub isses](https://github.com/dotnet/dotnet-api-docs/issues). The documentation for APIs is built from the text in this repo, and the samples in the [dotnet/samples](https://github.com/dotnet/samples) repository. You can select the [Repo - samples](https://github.com/dotnet/docs/issues?q=is%3Aopen+is%3Aissue+label%3A%22%3Afile_folder%3A+Repo+-+samples%22) label to see issues that concern sample code.
 
 This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community. For more information, see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).