[docs] [issue26582] asyncio documentation links to wrong CancelledError

[Berker Peksag]

Berker Peksag added the comment:

CancelledError documentation needs to be updated to mention that it is an alias for 'concurrent.futures.CancelledError'. We also need to update all ``:exc:`~concurrent.futures.CancelledError``` usages in Doc/library/asyncio*.rst. I'd prefer to reuse the description of https://docs.python.org/3.5/library/concurrent.futures.html#concurrent.futures.CancelledError

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nosy: +berker.peksag
stage:  -> patch review
type:  -> enhancement

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<http://bugs.python.org/issue26582>
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