[docs] [issue12781] Mention SO_REUSEADDR near socket doc examples

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 126069a5ecf6 by Sandro Tosi in branch '3.2':
#12781: Mention SO_REUSEADDR flag near socket examples
http://hg.python.org/cpython/rev/126069a5ecf6

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