gh-91755: Document Py_IncRef and Py_DecRef as C functions (GH-91805)

Co-authored-by: Erlend Egeberg Aasland <[email protected]>
Co-authored-by: Jelle Zijlstra <[email protected]>
(cherry picked from commit 58a3d28)

Co-authored-by: Charlie Zhao <[email protected]>

Author: miss-islington

Diff for: Doc/c-api/refcounting.rst

@@ -109,11 +109,17 @@ objects.
    It is a good idea to use this macro whenever decrementing the reference
    count of an object that might be traversed during garbage collection.
 
+.. c:function:: void Py_IncRef(PyObject *o)
+
+   Increment the reference count for object *o*. A function version of :c:func:`Py_XINCREF`.
+   It can be used for runtime dynamic embedding of Python.
+
+
+.. c:function:: void Py_DecRef(PyObject *o)
+
+   Decrement the reference count for object *o*. A function version of :c:func:`Py_XDECREF`.
+   It can be used for runtime dynamic embedding of Python.
 
-The following functions are for runtime dynamic embedding of Python:
-``Py_IncRef(PyObject *o)``, ``Py_DecRef(PyObject *o)``. They are
-simply exported function versions of :c:func:`Py_XINCREF` and
-:c:func:`Py_XDECREF`, respectively.
 
 The following functions or macros are only for use within the interpreter core:
 :c:func:`_Py_Dealloc`, :c:func:`_Py_ForgetReference`, :c:func:`_Py_NewReference`,