[docs] [issue17378] Document that ctypes automatically applies byref() when argtypes declares POINTER

[Roundup Robot]

Roundup Robot added the comment:

New changeset 76be5efa0d86 by Eli Bendersky in branch '3.2':
Issue #17378: ctypes documentation fix.
http://hg.python.org/cpython/rev/76be5efa0d86

New changeset 2cd2d8f8f72f by Eli Bendersky in branch '3.3':
Issue #17378: ctypes documentation fix.
http://hg.python.org/cpython/rev/2cd2d8f8f72f

New changeset 58c07ba40926 by Eli Bendersky in branch 'default':
Issue #17378: ctypes documentation fix.
http://hg.python.org/cpython/rev/58c07ba40926

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nosy: +python-dev

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