Fix spelling of 'accessible'
Fix spelling of 'accessible'

http://www.pivotaltracker.com/story/show/58009052

alphagov/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,alphagov/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,askl56/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,askl56/whitehall,robinwhittleton/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,robinwhittleton/whitehall,ggoral/whitehall,ggoral/whitehall,askl56/whitehall,hotvulcan/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall