code: func (o HostNetworkSystem) RemovePortGroup(ctx context.Context, pgName string) error {
  	req := types.RemovePortGroup{
  		This:   o.Reference(),
  		PgName: pgName,
  	}
  
  	_, err := methods.RemovePortGroup(ctx, o.c, &req)
  	if err != nil {
  		return err
  	}
  
  	return nil
  }
docs: // RemovePortGroup wraps methods.RemovePortGroup