Special attributes:is the class name;
__name__is the module name in which the class was defined;
__module__is the dictionary containing the class’s namespace;
__dict__is a tuple (possibly empty or a singleton) containing the base classes, in the order of their occurrence in the base class list;
__bases__is the class’s documentation string, or
The line has been there since before Python 3 was released. Here's the 2007 commit. When the object model was revamped to get rid of old-style classes, it looks like that information in the docs slipped through review and is likely just misinformation now.
May I suggest you raise a documentation issue to clear up whether it is incorrect/outdated.