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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 514571268743 by Berker Peksag in branch '3.5':
Issue #29441: Update examples to use async and await keywords in asyncio-task.rst
https://hg.python.org/cpython/rev/514571268743

New changeset 975e03b0aea6 by Berker Peksag in branch '3.6':
Issue #29441: Merge from 3.5
https://hg.python.org/cpython/rev/975e03b0aea6

New changeset ee074604bf0c by Berker Peksag in branch 'default':
Issue #29441: Merge from 3.6
https://hg.python.org/cpython/rev/ee074604bf0c

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nosy: +python-dev

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