Move Py_ARRAY_LENGTH to Useful macros, use 'generally equivalent'

Author: Yashp002

Doc/c-api/intro.rst

@@ -303,6 +303,18 @@ 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 (number of elements) of a statically allocated C array at
+   compile time.
+
+   The *array* argument must be a C array with a size known at compile time,
+   not a pointer. Using this macro with a pointer will produce incorrect results.
+
+   This is generally equivalent to::
+
+      sizeof(array) / sizeof((array)[0])
+
 
 .. _api-objects:
 

Doc/c-api/structures.rst

@@ -730,20 +730,7 @@ Macro name                       C type                        Python type
 
       Always ``None``. Must be used with :c:macro:`Py_READONLY`.
 
-   .. c:macro:: Py_ARRAY_LENGTH(array)
-
-      Compute the length (number of elements) of a statically allocated C array at
-      compile time.
-
-      The *array* argument must be a C array with a size known at compile time,
-      not a pointer. Using this macro with a pointer will produce incorrect results.
-
-      This macro is defined as::
-
-          #define Py_ARRAY_LENGTH(array) (sizeof(array) / sizeof((array)[0]))
-
-   .. versionadded:: 3.13
-
+      
 
 Defining Getters and Setters
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^