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bpo-32528: Document the change in inheritance of asyncio.CancelledError (GH-21474) 

#msg373510

[bpo-32528]()/#13528 changed `asyncio.CancelledError` such that it no longer inherits from `concurrent.futures.CancelledError`. As this affects existing code, specifically when catching the latter instead of the former in exception handling, it should be documented in the "What's new in 3.8?" document.

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@ -646,7 +646,8 @@ loop on every invocation:
(Contributed by Yury Selivanov in :issue:`37028`.)
The exception :class:`asyncio.CancelledError` now inherits from
:class:`BaseException` rather than :class:`Exception`.
:class:`BaseException` rather than :class:`Exception` and no longer inherits
from :class:`concurrent.futures.CancelledError`.
(Contributed by Yury Selivanov in :issue:`32528`.)
On Windows, the default event loop is now :class:`~asyncio.ProactorEventLoop`.
@ -1951,7 +1952,8 @@ Changes in the Python API
(Contributed by Anthony Sottile in :issue:`36264`.)
* The exception :class:`asyncio.CancelledError` now inherits from
:class:`BaseException` rather than :class:`Exception`.
:class:`BaseException` rather than :class:`Exception` and no longer inherits
from :class:`concurrent.futures.CancelledError`.
(Contributed by Yury Selivanov in :issue:`32528`.)
* The function :func:`asyncio.wait_for` now correctly waits for cancellation