[docs] [issue35605] backported patch requires new sphinx, minimum sphinx version was not bumped

[Ned Deily]

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

Thanks for the additional PR.  Accepted for post-3.6.9 (PR 14576, commit a6d97e200863e7e5fc60bbc8f121b86a2098ef2d - message AWOL?)

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