Update dotnet client sample program url

Change the url to sample program from the "Simple" project to the example folder.

content/en/docs/reference/using-api/client-libraries.md

@@ -31,7 +31,7 @@ The following client libraries are officially maintained by
 | Language   | Client Library | Sample Programs |
 |------------|----------------|-----------------|
 | C          | [github.com/kubernetes-client/c](https://github.com/kubernetes-client/c/) | [browse](https://github.com/kubernetes-client/c/tree/master/examples)
-| dotnet     | [github.com/kubernetes-client/csharp](https://github.com/kubernetes-client/csharp) | [browse](https://github.com/kubernetes-client/csharp/tree/master/examples/simple)
+| dotnet     | [github.com/kubernetes-client/csharp](https://github.com/kubernetes-client/csharp) | [browse](https://github.com/kubernetes-client/csharp/tree/master/examples)
 | Go         | [github.com/kubernetes/client-go/](https://github.com/kubernetes/client-go/) | [browse](https://github.com/kubernetes/client-go/tree/master/examples)
 | Haskell    | [github.com/kubernetes-client/haskell](https://github.com/kubernetes-client/haskell) | [browse](https://github.com/kubernetes-client/haskell/tree/master/kubernetes-client/example)
 | Java       | [github.com/kubernetes-client/java](https://github.com/kubernetes-client/java/) | [browse](https://github.com/kubernetes-client/java/tree/master/examples)