The Release Notes beats for Fedora 18 are open: https://fedoraproject.org/wiki/Category:Documentation_beats. The beats cover specific areas of the next Fedora release and end up directly in the Release Notes that the Docs team produces. This is a great way for new contributors to leave their mark. Since all of the writing is done in the wiki, you don’t need to learn DocBook. All you need is a FAS account to log in to the wiki. So find an unclaimed beat that looks interesting to you and make it yours!