[issue23254] Document how to close the TCPServer listening socket

[Martin Panter]

Martin Panter added the comment:

Posting server_close.v2.patch, which tests fileno(), and uses a single space between the new sentences. Also added a bit to the how-to at the top (using doubly-spaced sentences to match the rest of the paragraph).

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Added file: http://bugs.python.org/file38271/server_close.v2.patch

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