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

[Guido van Rossum]

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.

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<http://bugs.python.org/issue29407>
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