[issue17232] Improve -O docs

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Cheryl: yes, with changes in responses to Ezio's review.

Nick or Antoine: has there been any change to meaning of -O or -OO that I am not remembering?

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versions: +Python 3.6, Python 3.7, Python 3.8 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17232>
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