[docs] [issue30939] Sphinx 1.6.3 deprecation warning for sphinx.util.compat.Directive in docs builds

[Ned Deily]

Ned Deily added the comment:


New changeset 64a9f3d961084819335ea011063eb8cb41733882 by Ned Deily in branch '2.7':
bpo-30939: Avoid Sphinx deprecation warning in docs build. (#2721) (#2725)
https://github.com/python/cpython/commit/64a9f3d961084819335ea011063eb8cb41733882


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