Wikipedia:Why Aren't These Pages Copyedited

The answer, of course, is very simple: it's because you, who know the correct spellings, grammar, etc., have idly passed by mistakes when you saw them. That's right, you could have corrected them simply by clicking on the "Edit this page" link and making a quick change, but noooo. You'd rather just complain, instead of doing something about it!

So get on the ball: go out there and do that copyediting!

See How do I edit a page?

If you have an itch to copyedit something, anything, click Random Page a few times. You'll eventually end up at a page that needs your tender loving attention.