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

[Anthony Sottile]

Change by Anthony Sottile <asottile at umich.edu>:


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pull_requests: +15320
pull_request: https://github.com/python/cpython/pull/15653

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