Re: doc elisp intro cross reference fixes

[Richard Stallman]

    Well, we also have defaults for the type ('sexp) and a few other
    things, so it might make sense to have something like a

    (defcustom-defaults :group FOO :type boolean :match ...)

I don't see a reason to expect the variables in one package
to have the same type, or any other aspect.  But they will
often have the same custom group.