Use Future[Any] instead of type[Any]

Author: srittau

docs/guides/writing_stubs.rst

@@ -786,8 +786,8 @@ When using :ref:`Any`, document the reason for using it in a comment, unless the
 reason is obvious. Ideally, document what types could be used. Obvious
 reasons can include:
 
-* Using :ref:`Any` as a type argument for a generic to say "any object of this
-  type is allowed", e.g. ``type[Any]``.
+* Using :ref:`Any` as a type argument for a generic with invariant type variables
+  to say "any object of this type is allowed", e.g. ``Future[Any]``.
 * Using ``dict[str, Any]`` or ``Mapping[str, Any]`` when the value types
   depends on the keys. But consider using :ref:`TypedDict` or
   ``dict[str, Incomplete]`` (temporarily) when the keys of the dictionary are