[docs] [issue24439] Feedback for awaitable coroutine documentation

[Martin Panter]

Martin Panter added the comment:

Thanks for reviewing this Yury. Here is a new patch:

* Drop the “native” term; distinguish by referring to “async def” where necessary
* Add generator version of display_date() coroutine example
* Change chained coroutine example over to “async def” and updated sequence diagram
* Change one other example over (then I ran into Issue 24495)
* Include Yury’s new documentation for @types.coroutine from Issue 24325

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Added file: http://bugs.python.org/file39798/async-doc.v3.patch

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