[docs] [issue35564] [DOC] Sphinx 2.0 will require master_doc variable set in conf.py

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +mdk

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35564>
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