[docs] [issue19023] ctypes docs: Unimplemented and undocumented features

[Roundup Robot]

Roundup Robot added the comment:

New changeset 034b077d3015 by Martin Panter in branch '2.7':
Issue #19023: Document ctypes array and pointer classes
https://hg.python.org/cpython/rev/034b077d3015

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<http://bugs.python.org/issue19023>
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