[docs] [issue24911] Context manager of socket.socket is not documented

[Roundup Robot]

Roundup Robot added the comment:

New changeset d5f7980dd654 by Martin Panter in branch '3.5':
Issue #24911: All socket objects are context managers; update examples
https://hg.python.org/cpython/rev/d5f7980dd654

New changeset 711201953505 by Martin Panter in branch 'default':
Issue #24911: Merge socket context manager doc from 3.5
https://hg.python.org/cpython/rev/711201953505

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nosy: +python-dev

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