Documentation tabs in groups still showing old wiki icon

Not sure how quick a fix this is for 1.8.1 or if it should go to 1.9.

If you look at a wiki page created in the Documentation tab listing for a group, you can see it's still showing the old icon.

See the screenshot (attached) or the following URL for an example:

http://www.curriki.org/xwiki/bin/view/Group_NassauBOCESGroup/Documentation