[docs] [issue30380] Sphinx 1.6.1 raising new warnings in docs build

[Brett Cannon]

Brett Cannon added the comment:


New changeset 5e2016dce92d66e6e1fb25e6ce39031d8c7d5412 by Brett Cannon in branch '3.6':
bpo-30380: Pin the version of Sphinx used to build the docs (GH-1612) (GH-1617)
https://github.com/python/cpython/commit/5e2016dce92d66e6e1fb25e6ce39031d8c7d5412


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