code: def create_description_node(field, state):
      
      doc_container_node = nodes.container()
      doc_container_node += parse_rst_content(field.doc, state)
  
      return doc_container_node
docs: Creates docutils nodes for the Field's description, built from the
      field's ``doc`` and ``optional`` attributes.
  
      Parameters
      ----------
      field : ``lsst.pex.config.Field``
          A configuration field.
      state : ``docutils.statemachine.State``
          Usually the directive's ``state`` attribute.
  
      Returns
      -------
      ``docutils.nodes.section``
          Section containing nodes for the description of the ``field``.