docs: def create_title_node(field_name, field, field_id, state, lineno):
      """Create docutils nodes for the configuration field's title and
      reference target node.
  
      Parameters
      ----------
      field : ``lsst.pex.config.Field``
          A configuration field.
      state : ``docutils.statemachine.State``
          Usually the directive's ``state`` attribute.
  
      Returns
      -------
      ``docutils.nodes.title``
          Title containing nodes for the title of the ``field`` and reference
          target.
      """
      # Reference target
      env = state.document.settings.env
      ref_target = create_configfield_ref_target_node(field_id, env, lineno)
  
      # Title is the field's attribute name
      title = nodes.title(text=field_name)
      title += ref_target
  
      return title