gh-141004: Document missing built-in iterator types in the C API

Doc/c-api/iterator.rst

@@ -52,6 +52,46 @@ sentinel value is returned.
    *sentinel*, the iteration will be terminated.
 
 
+Range Objects
+^^^^^^^^^^^^^
+
+.. c:var:: PyTypeObject PyRange_Type
+
+   The type object for :class:`range` objects.
+
+
+.. c:function:: int PyRange_Check(PyObject *o)
+
+   Return true if the object *o* is an instance of a :class:`range` object.
+   This function always succeeds.
+
+
+Builtin Iterator Types
+^^^^^^^^^^^^^^^^^^^^^^
+
+These are built-in iteration types that are included in Python's C API, but
+provide no additional functions. They are here for completeness.
+
+.. c:var:: PyTypeObject PyEnum_Type
+
+   The type object for :class:`enumerate` objects.
+
+
+.. c:var:: PyTypeObject PyMap_Type
+
+   The type object for :class:`map` objects.
+
+
+.. c:var:: PyTypeObject PyReversed_Type
+
+   The type object for :class:`reversed` objects.
+
+
+.. c:var:: PyTypeObject PyZip_Type
+
+   The type object for :class:`zip` objects.
+
+
 Other Iterator Objects
 ^^^^^^^^^^^^^^^^^^^^^^