bpo-31754: Fix type of 'itemsize' in PyBuffer_FillContiguousStrides (GH-3993)

diff --git a/Doc/c-api/buffer.rst b/Doc/c-api/buffer.rst
index 3d851b7..8c2de96 100644
--- a/Doc/c-api/buffer.rst
+++ b/Doc/c-api/buffer.rst
@@ -473,7 +473,7 @@
    (*order* is ``'A'``).  Return ``0`` otherwise.
 
 
-.. c:function:: void PyBuffer_FillContiguousStrides(int ndim, Py_ssize_t *shape, Py_ssize_t *strides, Py_ssize_t itemsize, char order)
+.. c:function:: void PyBuffer_FillContiguousStrides(int ndims, Py_ssize_t *shape, Py_ssize_t *strides, int itemsize, char order)
 
    Fill the *strides* array with byte-strides of a :term:`contiguous` (C-style if
    *order* is ``'C'`` or Fortran-style if *order* is ``'F'``) array of the