Fix: Use **params**: format for custom linter compliance

Author: shoaib-inamdar

test/widget_tests/painters/painter_test_helpers.dart

@@ -8,10 +8,11 @@ import 'package:flutter_test/flutter_test.dart';
 /// This helper creates a standard MaterialApp scaffold with a CustomPaint
 /// widget for testing custom painters in a consistent way across all tests.
 ///
-/// @param painter The CustomPainter instance to test.
-/// @param key A unique key to identify the CustomPaint widget in tests.
-/// @param width The width of the canvas (default: 200).
-/// @param height The height of the canvas (default: 200).
+/// **params**:
+/// * `painter`: The CustomPainter instance to test.
+/// * `key`: A unique key to identify the CustomPaint widget in tests.
+/// * `width`: The width of the canvas (default: 200).
+/// * `height`: The height of the canvas (default: 200).
 Widget buildPainterTestWidget({
   required CustomPainter painter,
   required Key key,
@@ -39,7 +40,8 @@ Widget buildPainterTestWidget({
 /// Verifies that the [paint] method completes without throwing exceptions
 /// for various standard and edge-case canvas sizes.
 ///
-/// @param createPainter A factory function that returns a new instance of the [CustomPainter] to test.
+/// **params**:
+/// * `createPainter`: A factory function that returns a new instance of the [CustomPainter] to test.
 void runPaintSmokeTests(CustomPainter Function() createPainter) {
   group('paint() method smoke tests', () {
     final sizes = [