Re: Undocumented hyperlinks in doc strings.

[Richard Stallman]

    `button' being a text property, we can not just avoid to use it in
    documentation strings.  What about replacing:

                          ((boundp sym)
                           (help-xref-button 8 'help-variable sym))

    by:

                          ((and (boundp sym)
                                (not (string= sym "button")))
                           (help-xref-button 8 'help-variable sym))

Perhaps it should test that the variable has documentation
as a variable.  That would be cleaner.  Would that do the job?