[issue35293] make doctest (Sphinx) emits a lot of warnings

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> They are warnings related to third party packages used for doctest and some of them might become incompatible with https://github.com/python/cpython/pull/10596. Related discussion : issue35109

We should help these packages to be fixed :-)

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<https://bugs.python.org/issue35293>
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