Filled in the TODO gaps in the documentation for CancelableAsyncResult.
Filled in the TODO gaps in the documentation for CancelableAsyncResult.

WoLpH/celery,ask/celery,cbrepo/celery,mitsuhiko/celery,mitsuhiko/celery,ask/celery,WoLpH/celery,cbrepo/celery,frac/celery,frac/celery