docs: def builtin_info(builtin):
      """Show information on a particular builtin template"""
      help_obj = load_template_help(builtin)
      if help_obj.get('name') and help_obj.get('help'):
          print("The %s template" % (help_obj['name']))
          print(help_obj['help'])
      else:
          print("No help for %s" % builtin)
  
      if help_obj.get('args'):
          for arg, arg_help in iteritems(help_obj['args']):
              print("  %-*s %s" % (20, arg, arg_help))