code: private void maybeInitMetaDataFromJsDocOrHelpVar(
        Builder builder, Node varNode, @Nullable Node parentOfVarNode)
        throws MalformedException {
  
      // First check description in @desc
      if (maybeInitMetaDataFromJsDoc(builder, varNode)) {
        return;
      }
  
      // Check the preceding node for meta data
      if ((parentOfVarNode != null)
          && maybeInitMetaDataFromHelpVar(builder, varNode.getPrevious())) {
        return;
      }
  
      // Check the subsequent node for meta data
      maybeInitMetaDataFromHelpVar(builder, varNode.getNext());
    }
docs: Initializes the meta data in a JsMessage by examining the nodes just before
  and after a message VAR node.
  
  @param builder the message builder whose meta data will be initialized
  @param varNode the message VAR node
  @param parentOfVarNode {@code varNode}'s parent node