[docs] [issue26010] document CO_* constants

[Yury Selivanov]

Yury Selivanov added the comment:

Thank you Stephane for bumping this issue up.

I've committed the patch.  I've documented CO_ASYNC_GENERATOR in more detail, and I also added "versionadded" tags to CO_COROUTINE and CO_ITERABLE_COROUTINE.

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resolution:  -> fixed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26010>
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