Click History, click <prev> of one the earliest (bottom) one, copy the Green background text. Click Edit. Highlight your question, and delete it, and paste in the text you previously copied, and optionally enter an Edit Summary comment, and hit the Save Changes button. Then you'll be able to view the wiki page the way it was originally.
EDIT: You can also hit the Preview button before the Save Changes to get a preview of it.
Yther Ore.
Edited, Jul 3rd 2010 1:39pm by Yther