[CHORE] cleanup demo

Author: jay-k98

example/lib/presentation/samples/stacked_pie/stacked_pie_demo.dart

@@ -1,7 +1,6 @@
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
 
-// TODO: Remove
 class StackedPieDemo extends StatelessWidget {
   const StackedPieDemo({super.key});
 
@@ -31,7 +30,6 @@ class StackedPieDemo extends StatelessWidget {
     return StackedPieChart(
       StackedPieChartData(
         sections: [
-          // weight, value1, value2, [radius]
           createSectionData(60, 90, 10),
           createSectionData(60, 70, 30),
           createSectionData(60, 100, 0),