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[3.14] gh-141004: Document Py_ARRAY_LENGTH (GH-141601) (GH-141895)

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gh-141004: Document `Py_ARRAY_LENGTH` (GH-141601)
(cherry picked from commit e0773eacb7)

Co-authored-by: Yashraj <yashrajpala8@gmail.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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Doc/c-api/intro.rst
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@ -322,6 +322,19 @@ complete listing.
PyDoc_VAR(python_doc) = PyDoc_STR("A genus of constricting snakes in the Pythonidae family native "
"to the tropics and subtropics of the Eastern Hemisphere.");
.. c:macro:: Py_ARRAY_LENGTH(array)
Compute the length of a statically allocated C array at compile time.
The *array* argument must be a C array with a size known at compile time.
Passing an array with an unknown size, such as a heap-allocated array,
will result in a compilation error on some compilers, or otherwise produce
incorrect results.
This is roughly equivalent to::
sizeof(array) / sizeof((array)[0])
.. _api-objects: