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

[Ned Deily]

Ned Deily added the comment:

> I wonder if we should pin sphinx directly instead of the approximate pin we
> have now to prevent this sort of thing in the future?

Perhaps. OTOH, we will find out about Sphinx incompatibilities pretty quickly that way, rather than having doc builds potentially silently fail or only finding out about the problem at release time.

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