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

[Brett Cannon]

Brett Cannon added the comment:


New changeset fca224f117d25bdfec1bf7160b67438c4fcf6dee by Brett Cannon (Mariatta) in branch 'master':
bpo-30380: Pin the version of Sphinx used to build the documentation (GH-1612)
https://github.com/python/cpython/commit/fca224f117d25bdfec1bf7160b67438c4fcf6dee


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