[docs] [issue36932] asyncio-task.rst could use proper deprecated-removed directive

[Matthias Bussonnier]

Change by Matthias Bussonnier <bussonniermatthias at gmail.com>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python
versions: +Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36932>
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