docs: def do_notification_update(mc, args):
      '''Update notification.'''
      fields = {}
      fields['notification_id'] = args.id
      fields['name'] = args.name
  
      fields['type'] = args.type
      fields['address'] = args.address
      if not _validate_notification_period(args.period, args.type.upper()):
          return
      fields['period'] = args.period
      try:
          notification = mc.notifications.update(**fields)
      except (osc_exc.ClientException, k_exc.HttpError) as he:
          raise osc_exc.CommandError('%s\n%s' % (he.message, he.details))
      else:
          print(jsonutils.dumps(notification, indent=2))