[issue42431] Fix outdated bytes comments

[STINNER Victor]

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

(Sorry, I need more coffee. New attempt.)

A C extension must define Py_BUILD_CORE macro or variant to include such header file. There is no intent to technically prevent to include a header file, only an intent to warn users that they should not do that unless they understand what they do.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42431>
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