How to use the atelier.rstgen.boldheader function in atelier

if r.model is cls]
                s += rstgen.boldheader(_("Views on %s") %
                                       cls._meta.verbose_name)
                s += actors_overview_ul(model_reports)

                s += rstgen.boldheader(_("Fields in %s") %
                                       cls._meta.verbose_name)
                s += fields_ul(cls._meta.fields)

                action_list = cls.get_default_table().get_actions()
                action_list = [
                    ba for ba in action_list
                    if not isinstance(ba.action, IGNORED_ACTIONS)]
                if action_list:
                    s += '\n'
                    s += rstgen.boldheader(_("Actions on %s") %
                                           cls._meta.verbose_name)
                    s += actions_ul(action_list)

                slave_tables = getattr(cls, '_lino_slaves', {}).values()
                if slave_tables:
                    s += rstgen.boldheader(_("Tables referring to %s") %
                                           cls._meta.verbose_name)
                    s += actors_overview_ul(slave_tables)

                return s

            if issubclass(cls, actors.Actor):

                title = force_text(cls.label or cls.title)
                indextext = _('%(actor)s (view in %(app)s)') % dict(
                    actor=title, app=cls.app_label)

s += '\n:Implemented by: %s\n' % typeref(cls)
                s += '\n'

                if len(self.content) > 1:
                    s += '\n'.join(self.content[1:])
                    s += '\n\n'

                model_reports = [
                    r for r in kernel.master_tables if r.model is cls]
                model_reports += [r for r in kernel.slave_tables
                                  if r.model is cls]
                s += rstgen.boldheader(_("Views on %s") %
                                       cls._meta.verbose_name)
                s += actors_overview_ul(model_reports)

                s += rstgen.boldheader(_("Fields in %s") %
                                       cls._meta.verbose_name)
                s += fields_ul(cls._meta.fields)

                action_list = cls.get_default_table().get_actions()
                action_list = [
                    ba for ba in action_list
                    if not isinstance(ba.action, IGNORED_ACTIONS)]
                if action_list:
                    s += '\n'
                    s += rstgen.boldheader(_("Actions on %s") %
                                           cls._meta.verbose_name)
                    s += actions_ul(action_list)

                slave_tables = getattr(cls, '_lino_slaves', {}).values()
                if slave_tables:
                    s += rstgen.boldheader(_("Tables referring to %s") %