fix function name in example (closes #11966)

Doc/c-api/module.rst

@@ -192,7 +192,7 @@ These functions are usually used in the module initialization function.
 .. cfunction:: int PyModule_AddIntMacro(PyObject *module, macro)
 
    Add an int constant to *module*. The name and the value are taken from
-   *macro*. For example ``PyModule_AddConstant(module, AF_INET)`` adds the int
+   *macro*. For example ``PyModule_AddIntMacro(module, AF_INET)`` adds the int
    constant *AF_INET* with the value of *AF_INET* to *module*.
    Return ``-1`` on error, ``0`` on success.