[docs] [issue23254] Document how to close the TCPServer listening socket

[R. David Murray]

R. David Murray added the comment:

In general documentation changes go in all maintained versions (ie: right now that would be 2.7, 3.4, and default/3.5).  The only exception, really, would be if the change didn't apply to one or more of the versions because of code differences.  (Note: I haven't reviewed the patch itself yet ;)

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nosy: +r.david.murray
versions: +Python 2.7

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