Inconsistent formatting in gh-foundations.md

[thaddeuspearson]

I noticed there is some inconsistency with the formatting in gh-foundations.md, specifically in the GitHub Markdown section:

github-certification-guide/study-guides/gh-foundations.md

Line 113 in b929e77

Identify the text formatting toolbar on issue and pull request comments

Every other objective under each subheading is wrapped in a code block, but this section is not. If you would like to assign this to me, I would be more than happy to put in a quick fix for it!