docs: public static String getDidYouMeanMessageForProtoFields(
        ImmutableSet<String> fields, Descriptor descriptor, String fieldName) {
      // TODO(b/27616446): when we have case enum support add a case here.
      if (fields.contains(fieldName + "List")) {
        return String.format(" Did you mean '%sList'?", fieldName);
      } else if (fields.contains(fieldName + "Map")) {
        return String.format(" Did you mean '%sMap'?", fieldName);
      } else {
        return getDidYouMeanMessage(fields, fieldName);
      }
    }