[issue45618] Documentation builds fail with Sphinx 3.2.1

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

All of the open branches are affected by this since we also have to build documentation for security-fix-only branches when releases. PRs for 3.7 and 3.6 forthcoming.

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versions: +Python 3.6, Python 3.7, Python 3.8

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