If you like something, like it\! If you see anything you think could be improved \(e\.g\. typos, style issues, or things which could be explained better\) you're encouraged to propose an edit or leave a comment on the page\. Dive right in, you won't break anything :\)
would add "by highlighting text and using the menu that appears on the margin" (or other text that basically says this and also is consistent with how it works on mobile).