Update docs for disk name
Update docs for disk name

marxarelli/vagrant,mitchellh/vagrant,mitchellh/vagrant,sni/vagrant,mitchellh/vagrant,marxarelli/vagrant,sni/vagrant,marxarelli/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,marxarelli/vagrant,sni/vagrant,mitchellh/vagrant,sni/vagrant