Anyone can fix that kind of damage, just log into the wiki and revert the edit. Thanks for posting it though, always good to have multiple sets of eye's checking things out.
Especially since, as was posted, anyone can mess things up. Please be careful and remember to use the preview function before saving an edit. In this case it looks like it was an accident and the users edits before and since were fine. FYI, not Killswitch247, he was the one to have done the edit prior to the deletion. When looking at the history of an edit the panel on the left shows the person who brought it up to that point and the red text is what the person who's name is over the right panel removed. The right panel shows what that person then added.