[docs] [issue21485] remove unnecesary .flush() calls in the asyncio subprocess code example

[STINNER Victor]

STINNER Victor added the comment:

I wrote the example and the first call to buffer.flush() is a mistake. Thanks for your patch, I applied it.

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resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21485>
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