[docs] [issue35472] python 3.7.2 rc1 bumped sphinx requirements a bit too much

[Julien Palard]

Change by Julien Palard <julien+python at palard.fr>:


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title: python 3.7.2 rc1 bumped the build requirements for no reason -> python 3.7.2 rc1 bumped sphinx requirements a bit too much

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35472>
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