[docs] [issue29520] Documentation uses deprecated "defindex.html" Sphinx template

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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stage:  -> needs patch
type: compile error -> enhancement
versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29520>
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