[issue45618] Documentation builds fail with Sphinx 3.2.1

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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pull_requests: +27509
pull_request: https://github.com/python/cpython/pull/29245

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45618>
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