[issue19023] ctypes docs: Unimplemented and undocumented features

[David Goncalves]

Change by David Goncalves <davegoncalves at gmail.com>:


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nosy: +dpg
nosy_count: 11.0 -> 12.0
pull_requests: +24205
pull_request: https://github.com/python/cpython/pull/25480

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