code: def format_configfield_nodes(field_name, field, field_id, state, lineno):
      
      # Default data type node
      dtype_node = nodes.definition_list_item()
      dtype_node = nodes.term(text='Data type')
      dtype_def = nodes.definition()
      dtype_def_para = nodes.paragraph()
      name = '.'.join((field.dtype.__module__, field.dtype.__name__))
      dtype_def_para += pending_config_xref(rawsource=name)
      dtype_def += dtype_def_para
      dtype_node += dtype_def
  
      # Definition list for key-value metadata
      dl = nodes.definition_list()
      dl += dtype_node
      dl += create_field_type_item_node(field, state)
  
      # Doc for this field, parsed as rst
      desc_node = create_description_node(field, state)
  
      # Title for configuration field
      title = create_title_node(field_name, field, field_id, state, lineno)
  
      return [title, dl, desc_node]
docs: Create a section node that documents a ConfigField config field.
  
      Parameters
      ----------
      field_name : `str`
          Name of the configuration field (the attribute name of on the config
          class).
      field : ``lsst.pex.config.ConfigField``
          A configuration field.
      field_id : `str`
          Unique identifier for this field. This is used as the id and name of
          the section node. with a -section suffix
      state : ``docutils.statemachine.State``
          Usually the directive's ``state`` attribute.
      lineno (`int`)
          Usually the directive's ``lineno`` attribute.
  
      Returns
      -------
      ``docutils.nodes.section``
          Section containing documentation nodes for the ConfigField.