Update typing.rst

Author: dantetemplar

Doc/library/typing.rst

@@ -413,6 +413,7 @@ example::
 Note that ``type[C]`` is covariant::
 
    class User: ...
+
    class BasicUser(User): ...
    class ProUser(User): ...
    class TeamUser(User): ...
@@ -431,6 +432,7 @@ Note that ``type[C]`` is covariant::
 The only legal parameters for :class:`type` are classes, :data:`Any`,
 :ref:`type variables <generics>`, and unions of any of these types.
 For example::
+
    class HeroUser(ProUser): ...
    class RegularUser(BasicUser): ...
    class ManagerUser(TeamUser): ...