improved doc

lib/src/chart/bar_chart/bar_chart_data.dart

@@ -713,9 +713,11 @@ class BarTouchTooltipData with EquatableMixin {
   /// if [BarTouchData.handleBuiltInTouches] is true,
   /// [BarChart] shows a tooltip popup on top of rods automatically when touch happens,
   /// otherwise you can show it manually using [BarChartGroupData.showingTooltipIndicators].
-  /// Tooltip shows on top of rods, with [getTooltipColor] as a background color,
-  /// and you can set corner radius using [tooltipRoundedRadius], of if you need a custom
-  /// border you can use [tooltipBorderRadius].
+  /// Tooltip shows on top of rods, with [getTooltipColor] as a background color.
+  /// You can set the corner radius using [tooltipRoundedRadius], 
+  /// or if you need a custom border, you can use [tooltipBorderRadius].
+  /// Note that if both [tooltipRoundedRadius] and [tooltipBorderRadius] are set, 
+  /// the value from [tooltipBorderRadius] will be used.
   /// If you want to have a padding inside the tooltip, fill [tooltipPadding],
   /// or If you want to have a bottom margin, set [tooltipMargin].
   /// Content of the tooltip will provide using [getTooltipItem] callback, you can override it