Explain how to update the docs including code snippets

[mysticmind]

@AlexZeitler with regards to the following:

Then you can refer to the code example in the Markdown file by using the following syntax:

<!-- snippet: sample_my_unique_name -->
<!-- endsnippet -->

you could add the same in code in some unit test file and use it.

[AlexZeitler]

@mysticmind makes sense - will do!

[AlexZeitler]

@mysticmind doing it and running mdsnippets or docs-build will compile the snippet into CONTRIBUTING.md.

Too bad MarkdownSnippets doesn't have an option to ignore single Markdown files.

[AlexZeitler]

I was already thinking about just adding a screenshot of the Markdown section

[mysticmind]

A screenshot is good enough and trivial to do!

[AlexZeitler]

@mysticmind Added the screenshot