Remove notion about variadics completely

Author: Daraan

docs/spec/callables.rst

@@ -453,8 +453,8 @@ a function within a type expression. The syntax is
 
 Parameters specified using ``Callable`` are assumed to be positional-only.
 The ``Callable`` form provides no way to specify keyword-only parameters,
-variadic keyword-only parameters, or default argument values. For these use
-cases, see the section on `Callback protocols`_.
+or default argument values. For these use cases, see the section on 
+`Callback protocols`_.
 
 Meaning of ``...`` in ``Callable``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^