[docs] [issue11975] Fix referencing of built-in types (list, int, ...)

Jonas H. <jonas@lophus.org> added the comment: Linking a class using a function directive is counter-intuitive. That's why we need to make use of class directives rather than function directives here. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue11975> _______________________________________