[docs] [issue17232] Improve -O docs

[Antoine Pitrou]

Antoine Pitrou added the comment:

There's a typo in your patch:

+-O     : remove assert and __debug__-dependent statements; change .py\n\
+         to .pyo; also PYTHONOPTIMIZE=x\n\

should say ".pyc", not ".py".

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