axisTitleData missing in LineChartData

In the doc for the LineChartData as well as in the doc comment for it, the axisTitleData is mentioned.

But LineChartData has no axisTitleData, which probably should be there.

Code to reprouce

class Test extends StatelessWidget {
  const Test({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return LineChart(
      LineChartData(
        axisTitleData: AxisTitles(),
      ),
    );
  }
}