docs: public final LocatedString contentLocatedSubstringByContentOffsets(
        final OffsetRange<CharOffset> contentOffsets) {
      final UnicodeFriendlyString substringText = content().substringByCodePoints(contentOffsets);
      final List<CharacterRegion> substringOffsets =
          offsetsOfSubstringByContentCodepointOffsets(contentOffsets);
      return new LocatedString.Builder().content(substringText).referenceString(referenceString())
          .characterRegions(substringOffsets).build();
    }