code: def create_default_item_node(field, state):
      
      default_item = nodes.definition_list_item()
      default_item.append(nodes.term(text="Default"))
      default_item_content = nodes.definition()
      default_item_content.append(
          nodes.literal(text=repr(field.default))
      )
      default_item.append(default_item_content)
      return default_item
docs: Create a definition list item node that describes the default value
      of a Field config.
  
      Parameters
      ----------
      field : ``lsst.pex.config.Field``
          A configuration field.
      state : ``docutils.statemachine.State``
          Usually the directive's ``state`` attribute.
  
      Returns
      -------
      ``docutils.nodes.definition_list_item``
          Definition list item that describes the default target of a
          ConfigurableField config.