[LukeShu]

No, he's writing in the syntax of Emacs org-mode, which GitHub also recognizes. Parts of it are similar to markdown, but parts are different.

For example, `markdown inline code` vs ~org-mode inline code~, and

    ```
    markdown code blocks
    ```

vs

    #+begin_src
    org-mode code blocks
    #+end_src

And [markdown links](https://daringfireball.net/projects/markdown/) vs [[http://orgmode.org/][org-mode links]].

[erelde]

Ah yes, I just looked quickly without reading the raw. Shoud have read the raw before writing non sense.