Write examples directly to asciidoc

[russcam]

This commit replaces the AsciiDoc include in generated examples with the C# source code.
Doing so also allows any examples to include callouts, similar to doc generation e.g.

var deleteResponse = client.Delete<Tweet>(1, d => d
    .Index("twitter")
    .Routing("kimchy") // <1> Use a routing parameter
);

will emit

[source,csharp]
----
var deleteResponse = client.Delete<Tweet>(1, d => d
    .Index("twitter")
    .Routing("kimchy") //<1>
);
----
<1>  Use a routing parameter

[Mpdreamz]

It might be good to add a notice/comment to the files now that these are generated and should not be edited directly.

[russcam]

It might be good to add a notice/comment to the files now that these are generated and should not be edited directly.

++

@nik9000, If these examples had a multine asciidoc comment in them, would that be an issue for the docs example build process, similar to what we do in the current .NET docs e.g.

////
IMPORTANT NOTE
==============
This file has been generated from <path to file>. 
If you wish to submit a PR for any spelling mistakes, typos or grammatical errors for this file,
please modify the original csharp file found at the link and submit the PR with that change. Thanks!
////

[russcam]

@Mpdreamz I've added multiline comments that point back to the original file with line numbers, on GitHub. Would you mind taking another look, please?

[Mpdreamz]

Awesome, lgtm 👍