[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 bbd0f423d2a19c6a4a9cda6914fc60b87e17250b by Ned Deily in branch '3.6':
bpo-30939: Avoid Sphinx deprecation warning in docs build. (#2721) (#2722)
https://github.com/python/cpython/commit/bbd0f423d2a19c6a4a9cda6914fc60b87e17250b


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