Fix route constraint documentation.
Fix route constraint documentation.

Rails will complain if multiple routes are named the same. By using root
it was trying to create the root path multiple times. Also a route must
provide a controller and an action.

janusnic/clearance,janusnic/clearance,benlivermore/clearance,zernie/clearance,janusnic/clearance,thoughtbot/clearance,pedrosmmoreira/clearance,sferik/clearance,naveed-ahmad/clearance,pedrosmmoreira/clearance,benlivermore/clearance,thoughtbot/clearance,thoughtbot/clearance,zernie/clearance,pedrosmmoreira/clearance,benlivermore/clearance,naveed-ahmad/clearance,zernie/clearance,naveed-ahmad/clearance