Vagrant 1.1 has been released. The documentation you are reading is for
Vagrant 1.0.x. Read more about Vagrant 1.1 in the release announcement.
Or go straight to the 1.1 documentation.
This part of the site documents Vagrant from top-to-bottom, including all the details of every feature that Vagrant exposes. If you’re just getting started with Vagrant, it is highly recommended that you first read the getting started guide.