[docs] [issue29441] Update examples to use async and await keywords in asyncio-task.rst

[Berker Peksag]

Berker Peksag added the comment:

Thanks for the reviews!

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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/issue29441>
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