list_known_classes

# File lib/rdoc/ri/ri_display.rb, line 166
  def list_known_classes(classes)
    if classes.empty?
      warn_no_database
    else
      page do 
        @formatter.draw_line("Known classes and modules")
        @formatter.blankline
        @formatter.wrap(classes.sort.join(", "))
      end
    end
  end