list_known_classes

# File lib/rdoc/ri/display.rb, line 329
  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