[issue39712] Doc for `-X dev` option should mention PYTHONDEVMODE

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> An exception to that is `-X dev`, which can also be triggered by the PYTHONDEVMODE variable, but that isn't mentioned in the CLI doc.

I wrote a whole new page for -X dev: https://docs.python.org/dev/library/devmode.html#devmode

This page starts with:

"It can be enabled using the -X dev command line option or by setting the PYTHONDEVMODE environment variable to 1."

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