[docs] [issue9583] Document startup option/environment interaction

[Buck Golemon]

Buck Golemon <buck.golemon at amd.com> added the comment:

"that number of times" isn't exactly accurate either, since "0" is effectively interpreted as "1".

This change would only adversely affect people who use no -O option, set PYTHONOPTIMIZE to '0', and need optimization.
I feel like that falls into the realm of version differences, but that's your decision.

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