Rename variables in editions_controller_test.
Rename variables in editions_controller_test.

Rename document to edition where appropriate.

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