Please report Issues and submit Pull Requests for Content Fixes here. Never done a pull request (or "PR")? Here's the Pagure documentation for Pull Requests.
Note that since this is official Fedora Council documentation, changes need agreement from the Council first. (For these, file a Council ticket).
General appearance issues and publishing issues should be reported against the publishing software.
All of this is written in AsciiDoc. It's a simple mostly-plain-text markup language. You may want to look at:
To test your changes, first install
$ gem install ascii_binder
To build your changes, from the root directory:
$ asciibinder package $ firefox _package/main/index.html