isinstance(f, collections.Callable) is more correct

Doc/whatsnew/3.0.rst

@@ -804,8 +804,8 @@ Builtins
   ``f(*args)``.
 
 * Removed :func:`callable`.  Instead of ``callable(f)`` you can use
-  ``hasattr(f, '__call__')``.  The :func:`operator.isCallable` function
-  is also gone.
+  ``isinstance(f, collections.Callable)``.  The :func:`operator.isCallable`
+  function is also gone.
 
 * Removed :func:`coerce`.  This function no longer serves a purpose
   now that classic classes are gone.