[docs] [issue29407] Remove redundant ensure_future() calls in factorial example

Guido van Rossum added the comment: LGTM, and should be committed to 3.5 and merged upwards from there. And yes, it's time for the asyncio docs to converge on async/await everywhere, making `yield from` a footnoot to history. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue29407> _______________________________________