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

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

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

That's nice, but references for PYTHONFAULTHANDLER and PYTHONTRACEMALLOC are still missing. If you think the cross refs for -X dev and PYTHONDEVMODE clutters cmdline.html, I'll remove them from the PR.

Is it worth it adding https://docs.python.org/dev/library/devmode.html to 3.8 and possibly 3.7 as well?

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