The semi-automated article peer-reviewer checks pages against some basic Manual of Style (MOS) rules and generates a quick report.
It can be enabled as a Gadget in your user Preferences. Check off the box for: MoreMenu, adds Page and User dropdown menus...
After you save and your Preferences you will now have a tab on every page called Page. While you are at an article, hover on Page; hover on Tools; click on Peer reviewer.