code: public AnnotatedTextBuilder addGlobalMetaData(String key, String value) {
      customMetaData.put(key, value);
      return this;
    }
docs: Add any global meta data about the document to be checked. Some rules may use this information.
  Unless you're using your own rules for which you know useful keys, you probably want to
  use {@link #addGlobalMetaData(AnnotatedText.MetaDataKey, String)}.
  @since 3.9