...not because you did anything wrong, but because your edit included changes which are symptomatic of a known problem whereby the Visual Editor will corrupt the source of a page. This isn't your fault, of course, but we need to reject the edit to protect the page content.
Please feel free to resubmit your edit using the Source Editor ("Edit source" on the menu found at the top of the page in most skins) to eliminate the chance of further random corruption.
-- Looney Toons, admin