[docs] [issue12887] Documenting all SO_* constants in socket module

[Mark Lawrence]

Mark Lawrence added the comment:

@Sandro do you want to follow this up?  msg142613 was on #12781.

----------
nosy: +BreamoreBoy

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12887>
_______________________________________