[docs] [issue20582] socket.getnameinfo() does not document flags

[R. David Murray]

R. David Murray added the comment:

Like the other socket functions, you have to look it up in the man page.  A number of the other functions that take a flag argument mention this in their description, so a similar mention should be added to the getnameinfo entry.

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nosy: +r.david.murray
versions: +Python 3.3, Python 3.4

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