Update DataTable docs for disabled DataRow ink well (flutter#143450)

fixes [[`DataTable`] Data row does not respond to `MaterialState.hovered`](flutter#138968)

Author: TahaTesser

packages/flutter/lib/src/material/data_table.dart

@@ -194,6 +194,8 @@ class DataRow {
   /// [InkWell] is visible (when pressed, hovered and focused), it is
   /// recommended to use a translucent color.
   ///
+  /// If [onSelectChanged] or [onLongPress] is null, the row's [InkWell] will be disabled.
+  ///
   /// ```dart
   /// DataRow(
   ///   color: MaterialStateProperty.resolveWith<Color?>((Set<MaterialState> states) {
@@ -513,6 +515,9 @@ class DataTable extends StatelessWidget {
   /// row. To make sure that the row's [InkWell] is visible (when pressed,
   /// hovered and focused), it is recommended to use a translucent background
   /// color.
+  ///
+  /// If [DataRow.onSelectChanged] or [DataRow.onLongPress] is null, the row's
+  /// [InkWell] will be disabled.
   /// {@endtemplate}
   ///
   /// If null, [DataTableThemeData.dataRowColor] is used. By default, the