Fixed order=FORTRAN in docs
Added release snippet

* restored regression comment in
numpy/core/defchararray.py

* fixed the dimensionality of the z
array in all() docstring in
numpy/core/fromnumeric.py; this isn't
detected because it is in-line with
variable memory addresses which are
tagged as variable for refguide

* byte_bounds() docstring adjusted
to reflect non-variable dtype
after reviewer requested removal
of complex dtype

* restore an original comment
in matmul docstring, as requested
by reviewer

* ported the refguide_check module from SciPy for usage
in NumPy docstring execution/ verification; added the
refguide_check run to Azure Mac OS CI

* adjusted NumPy docstrings such that refguide_check passes

Fixes GH-12271

Tests verify that everything in ``dir(numpy)`` either has ``__module__`` set to
``'numpy'``, or appears in an explicit whitelist of undocumented functions and
exported bulitins. These should eventually be documented or removed.

I also identified a handful of functions for which I had accidentally not setup
dispatch for with ``__array_function__`` before, because they were listed under
"ndarray methods" in ``_add_newdocs.py``. I guess that should be a lesson in
trusting code comments :).