don't state that type[Callable] is invalid and don't refer to it as a special form

Author: KotlinIsland

docs/spec/special-types.rst

@@ -188,8 +188,8 @@ concrete class object, e.g. in the above example::
 ``type[T]`` where ``T`` is a type variable is allowed when annotating the
 first argument of a class method (see the relevant section).
 
-Any other :term:`special forms <special form>` like ``Callable`` are not
-allowed as an argument to ``type``.
+Some other :term:`special forms <special form>` like ``Literal`` or
+`TypedDict` are not allowed as an argument to ``type``.
 
 There are some concerns with this feature: for example when
 ``new_user()`` calls ``user_class()`` this implies that all subclasses