If you are just looking for something to do, instead of mindlessly poking the WordPress Codex, check out the http://codex.wordpress.org/Category:Copyedit listing. These are articles in our special category for noting articles in need of editing, review, and fixing.
Edit away. If it looks like it’s done, remove the category and it will go off the list. Find one that needs to be in that category, please add [[Category:Copyedit]] to the bottom of the post.