[issue17232] Improve -O docs

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

We don't change the extension on optimised pyc files any more, we add an optimisation marker to the name without changing the file extension: https://www.python.org/dev/peps/pep-0488/

(This means `-O` and `-OO` don't tread on each other any more)

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<https://bugs.python.org/issue17232>
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