[issue901727] extra_path kwarg to setup() undocumented

[Alexis Metaireau]

Alexis Metaireau <alexis at notmyidea.org> added the comment:

Still, the extra_path argument exists and can be used, it's worth to
have it documented somewhere, especially if someone have done it.

That's also true that apiref.rst is outdated in d2, and will need a
complete reshape :)

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