code: private static boolean maybeInitMetaDataFromJsDoc(Builder builder, Node node) {
      boolean messageHasDesc = false;
      JSDocInfo info = node.getJSDocInfo();
      if (info != null) {
        String desc = info.getDescription();
        if (desc != null) {
          builder.setDesc(desc);
          messageHasDesc = true;
        }
        if (info.isHidden()) {
          builder.setIsHidden(true);
        }
        if (info.getMeaning() != null) {
          builder.setMeaning(info.getMeaning());
        }
      }
  
      return messageHasDesc;
    }
docs: Initializes the meta data in a message builder given a node that may
  contain JsDoc properties.
  
  @param builder the message builder whose meta data will be initialized
  @param node the node with the message's JSDoc properties
  @return true if message has JsDoc with valid description in @desc
  annotation