address review: c_div naming

Author: skirpichev

peps/pep-0791.rst

@@ -119,7 +119,7 @@ There are possible additions, among proposed in the initial discussion thread
 (see also issue
 `python/cpython#81313 <https://github.com/python/cpython/issues/81313>`_):
 
-* ``c_div()`` --- for integer ceiling divide, see
+* ``ceil_div()`` --- for integer ceiling divide, see
   `relevant discussion thread <https://discuss.python.org/t/91269>`_.
 * ``gcdext()`` --- to solve linear `Diophantine equation <https://en.wikipedia.org/wiki/Diophantine_equation>`_ in two variables (the
   :external+py3.14:class:`int` implementation actually includes an extended