While the issue of using "latex" instead of "LaTeX" is a small issue (not many authors have to be reminded of the fact), it would be nice to prompt the user and say something along the lines of, "Hey! You should use the proper capitalization of LaTeX instead of latex" and allow the user to either edit their question, or post it regardless.
I think this is a really bad idea. We strive to be an inclusive site, and enforcing such capitalizations is a great way to foster exactly the opposite view: "there are those of us who know the 'right' way and you are in the group that doesn't know the 'right' way."
As for editing, editing a post just for such 'errors' is also inappropriate; if there are other worthwhile things to fix in a post, then fixing the capitalization of LaTeX is fine, but it should not be the main or only reason for editing a post.