http://docs.python.org/3.3/library/socket.html#socket.getaddrinfo

> Changed in version 3.2: parameters can now be passed as single keyword arguments.

What *single* means?
I can use multiple keyword arguments:

In [3]: socket.getaddrinfo('www.python.org', 80, proto=socket.SOL_TCP, family=socket.AF_INET)
Out[3]:
[(<AddressFamily.AF_INET: 2>,
  <SocketType.SOCK_STREAM: 1>,
  6,
  '',
  ('82.94.164.162', 80))]

'Single' that argument passing has changed, but I would have to know what it was previously (3.1) to know what the change is. Perhaps you can review the 3.1 signature and suggest a better wording for the change note.

New changeset 3352b5abe1e4 by Andrew Kuchling in branch '3.3':
Clarify versionchanged sentence.  Closes #20497.
http://hg.python.org/cpython/rev/3352b5abe1e4

That line of documentation was introduced in changeset ca2a859e9bf6, which was issue #8866.  Previously the parameters to getaddrinfo() were positional, so you had to supply all 5 of them.