We're always looking for contributions to help improve these materials. If you have corrections, polish, or materials contributions, please submit them via a Pull Request.
If your contribution is larger than a syntax fix or sentence re-wording, please initiate a discussion via a new Issue (type c after switching focus to the Issues tab) so we can help guide your contribution to the right location in the materials.
This site uses GitHub's CSS toolkit called Primer. It's easy to use, and if your contribution requires some design or front-end work you should check out the Primer Docs.