At the bottom of (almost) every page on w3schools.com they have a link called "Help W3Schools. Suggest corrections to this page." which opens a contact form so users can (obviously) suggest corrections to the page.
For example. on this page, WP 3.3 shows up twice. Once with a planned release in 2011 and once for 2012.
Could be especially useful for a passerby using the Codex who spots a mistake but doesn't want to invest in a wordpress.org account