[docs] [issue27896] Allow passing sphinx options to Doc/Makefile

[STINNER Victor]

STINNER Victor added the comment:

I pushed your patch to the default branch (Python 3.7). Thanks Julien.

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nosy: +haypo
resolution:  -> fixed
status: open -> closed
type:  -> enhancement
versions: +Python 3.7 -Python 3.6

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<http://bugs.python.org/issue27896>
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