[2.7] bpo-35605: Fix documentation build for sphinx<1.6 #12413
Merged
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This one allow Python 2.7 to be build using Sphinx 1.2 as the conf.py says and to be built using Sphinx 2.0.0 (html_sidebars no longer accepting a string, but it accepts a list since Sphinx 1.0)
https://bugs.python.org/issue35605