[docs] [issue17232] Improve -O docs

[Terry J. Reedy]

Terry J. Reedy added the comment:

I added :const: and tweaked -OO entry and -h startup display.
Tested new html and python_d -h. Any other comments before I apply?

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assignee: docs at python -> terry.reedy
Added file: http://bugs.python.org/file29392/17232-O.diff

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