[docs] [issue18017] ctypes.PyDLL documentation

[eryksun]

eryksun added the comment:

16.17.2.2 already has a warning after it introduces CDLL, OleDLL, and WinDLL:

    The Python global interpreter lock is released before 
    calling any function exported by these libraries, and 
    reacquired afterwards.

It links to the glossary entry:

    https://docs.python.org/3/glossary.html#term-global-interpreter-lock

It wouldn't hurt to elaborate and box this warning.

Subsequently, PyDLL is documented to *not* release the GIL. Also,  section 16.17.2.4 documents that CFUNCTYPE and WINFUNCTYPE functions release the GIL and PYFUNCTYPE functions will *not* release the GIL.

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nosy: +eryksun

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