[docs] [issue35605] backported patch requires new sphinx, minimum sphinx version was not bumped

[Ned Deily]

Ned Deily <nad at python.org> added the comment:


New changeset 9bacdce451618a5f0bf62cb1b6f966ebde0492c6 by Ned Deily (Anthony Sottile) in branch '3.6':
[3.6] bpo-35605: Fix documentation build for sphinx<1.6 (GH-11368)
https://github.com/python/cpython/commit/9bacdce451618a5f0bf62cb1b6f966ebde0492c6


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