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

[Berker Peksag]

Berker Peksag added the comment:

Thanks for the review, Guido.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29407>
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