code: def __PrintMessageCommentLines(self, message_type):
          
          description = message_type.description or '%s message type.' % (
              message_type.name)
          width = self.__printer.CalculateWidth() - 3
          for line in textwrap.wrap(description, width):
              self.__printer('// %s', line)
          PrintIndentedDescriptions(self.__printer, message_type.enum_types,
                                    'Enums', prefix='// ')
          PrintIndentedDescriptions(self.__printer, message_type.message_types,
                                    'Messages', prefix='// ')
          PrintIndentedDescriptions(self.__printer, message_type.fields,
                                    'Fields', prefix='// ')
docs: Print the description of this message.