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

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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keywords: +patch
Added file: https://bugs.python.org/file48926/0001-bpo-39712.patch

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39712>
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