[doc] fix typo in reference to tp_descr_get and tp_descr_set (GH-94140)

(cherry picked from commit 32d595f)

Co-authored-by: Max Bachmann <[email protected]>

Author: miss-islington

Doc/c-api/typeobj.rst

@@ -2522,11 +2522,11 @@ Slot Type typedefs
 
 .. c:type:: PyObject *(*descrgetfunc)(PyObject *, PyObject *, PyObject *)
 
-   See :c:member:`~PyTypeObject.tp_descrget`.
+   See :c:member:`~PyTypeObject.tp_descr_get`.
 
 .. c:type:: int (*descrsetfunc)(PyObject *, PyObject *, PyObject *)
 
-   See :c:member:`~PyTypeObject.tp_descrset`.
+   See :c:member:`~PyTypeObject.tp_descr_set`.
 
 .. c:type:: Py_hash_t (*hashfunc)(PyObject *)