[issue34231] PYTHONBREAKPOINT is not documented with python --help

[Stéphane Wirtel]

New submission from Stéphane Wirtel <stephane at wirtel.be>:

there is no documentation about PYTHONBREAKPOINT when we execute python --help.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34231>
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