doc: obsolete reference to NPY_OWNDATA

[AntoineD]

In numpy/doc/source/reference/c-api.array.rst, shouldn't it be NPY_ARRAY_OWNDATA instead?

[mattip]

It would be nice to go through all the NPY_* in numpy/core/include/numpy/old_defines.h and make sure none of them are still in the documentation

[sethtroisi]

cat ./numpy/core/include/numpy/old_defines.h | grep '^#define [a-zA-Z0-9_-]*' | awk '{print $2}' | xargs -I {} sh -c 'echo {}; echo; grep --exclude old_defines.h -r "\b{}\b" .'

# Omitting all symbols with no matches

OLD_DEFINES_H
./numpy/core/include/numpy/npy_no_deprecated_api.h:    defined(OLD_DEFINES_H)

NDARRAY_VERSION
./numpy/core/_add_newdocs.py:    Return the compile time NDARRAY_VERSION number.

PyArray_VOID
./doc/records.rst.txt:  This will be converted to a ``PyArray_VOID`` type with corresponding
./doc/records.rst.txt:  typeobject (and ``PyArray_VOID``) typenumber.  If the type is
./doc/records.rst.txt:  Otherwise a new ``PyArray_VOID PyArray_Descr*`` structure is created