doc: fix documented winmode argument default in ctypes CDLL classes.

[carandraug]

The default value for the winmode argument in the ctypes CDLL, OleDll, and WinDLL classes is None and not 0 as currently documented. These have different behaviours. None means ctypes default of LOAD_LIBRARY_SEARCH_DEFAULT_DIRS | LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR while 0 means no LOAD_LIBRARY_SEARCH_* flag which defaults to Windows LoadLibrary behaviour.

I did read the contribution guidelines and started to describe an issue on the Python bug tracker but this seems to me like one of those trivial changes that are described as being exempt of that. Please let me know if I'm wrong.

[the-knights-who-say-ni]

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[carandraug]

The only check that this PR seems to be failing is that there's no # issue in title. I think this fix is trivial enough to receive the "skip issue" label (please correct me if I'm wrong). Can someone let me know what else is needed from me?