code: func (s *PresenceService) DeleteTrustedCluster(name string) error {
  	if name == "" {
  		return trace.BadParameter("missing trusted cluster name")
  	}
  	err := s.Delete(context.TODO(), backend.Key(trustedClustersPrefix, name))
  	if err != nil {
  		if trace.IsNotFound(err) {
  			return trace.NotFound("trusted cluster %q is not found", name)
  		}
  	}
  	return trace.Wrap(err)
  }
docs: // DeleteTrustedCluster removes a TrustedCluster from the backend by name.