[docs] [issue36853] inconsistencies in docs builds (Sphinx 2)

[SilentGhost]

SilentGhost <ghost.adh at runbox.com> added the comment:

> Second, we should probably determine why the doc builds are failing on Sphinx 2 and update the `suspicious` code to support Sphinx 2.

They're failing because in sphinx 2 old and deprecated (since 1.6) custom logging API was removed. So all Builder.warn calls will have to be changed to use logging module (this applies to other similar methods, luckily they had the same names as logging methods).

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nosy: +SilentGhost

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36853>
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