[docs] [issue34118] Fix some class entries in 'Built-in Functions'

Terry J. Reedy <tjreedy@udel.edu> added the comment: SO user abarnert, who I presume is bpo abarnert (Andrew Barnert) claims that "Create a new dictionary. The dict object is the dictionary class." sounds a bit like dict returns the dictionary class. It is different from "Return a new set object, ... . set is a built-in class." I like the latter better and will use it as the pattern. ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue34118> _______________________________________