DOC: Update release notes to mention type(dtype) is not np.dtype
#17914
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This also requires mentioning the C-API macro
#define PyArray_DescrCheck(op) PyObject_TypeCheck(op, &PyArrayDescr_Type)
which was updated to the above in 1.16.6 meaning that using the
macro and compiling against an older NumPy version will cause
issues. The macro has to be avoided in that case.