[issue19270] Document that sched.cancel() doesn't distinguish equal events and can break order

[Bar Harel]

Bar Harel <bzvi7919 at gmail.com> added the comment:

@Raymond your first idea sounds good and was the first thing that came to my mind.
I only worried about breaking things, so I gave the more conservative suggestion.

If breaking a few eggs isn't an issue and the implications of your idea are agreed upon, I'll patch and add a PR.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19270>
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