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

[STINNER Victor]

STINNER Victor added the comment:

> do agree that asyncio.CancelledError should be documented?

Yes, I would prefer to get the exception from asyncio, even if it is
officially an alias to an exception of a different module.

It would be surprising to have to import concurrent.futures in a
module written for asyncio, just to catch this exception.

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