Board Thread:Site Questions/@comment-24821182-20140504035216/@comment-5643552-20140504040423

Not public domain, per se. All content on here is licensed under CC BY-SA, which allows you to modify (edit) and share content granted that you credit the original author(s). That's one of the reasons the "history" tab exists, in fact.

This particular wiki frowns upon modifying the actual story and making other undue changes to pages without the author's consent, but just correcting grammar is fine. No one should be complaining about that.