pythonGH-121970: Rewrite the C-API annotations extension

Author: AA-Turner

Doc/c-api/module.rst

@@ -342,7 +342,8 @@ The available slot types are:
    The *value* pointer of this slot must point to a function of the signature:
 
    .. c:function:: PyObject* create_module(PyObject *spec, PyModuleDef *def)
-      :noindex:
+      :no-index-entry:
+      :no-contents-entry:
 
    The function receives a :py:class:`~importlib.machinery.ModuleSpec`
    instance, as defined in :PEP:`451`, and the module definition.
@@ -377,7 +378,8 @@ The available slot types are:
    The signature of the function is:
 
    .. c:function:: int exec_module(PyObject* module)
-      :noindex:
+      :no-index-entry:
+      :no-contents-entry:
 
    If multiple ``Py_mod_exec`` slots are specified, they are processed in the
    order they appear in the *m_slots* array.