[issue27700] Document asyncio.AbstractEventLoop, not asyncio.BaseEventLoop

[Guido van Rossum]

Guido van Rossum added the comment:

Here's a tentative diff. I did a global replace BaseEventLoop -> AbstractEventLoop and added an entry for BaseEventLoop (just above AbstractEventLoop) explaining that it should not be used.  Please review for obvious mistakes.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27700>
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