Apply suggestions from code review

Co-authored-by: Allison Ryan <77211884+allisonryan0002@users.noreply.github.com>

packages/pinball_components/lib/src/components/backboard/backboard.dart

@@ -55,7 +55,7 @@ class Backboard extends PositionComponent with HasGameRef {
 
   /// Puts the Backboard in waiting mode, where the scoreboard is shown.
   Future<void> waitingMode() async {
-    children.removeWhere((element) => true);
+    children.removeWhere((_) => true);
     await add(BackboardWaiting());
   }
 
@@ -64,7 +64,7 @@ class Backboard extends PositionComponent with HasGameRef {
     required int score,
     BackboardOnSubmit? onSubmit,
   }) async {
-    children.removeWhere((element) => true);
+    children.removeWhere((_) => true);
     await add(
       BackboardGameOver(
         score: score,

packages/pinball_components/lib/src/flame/keyboard_input_controller.dart

@@ -5,7 +5,7 @@ import 'package:flutter/services.dart';
 typedef KeyHandlerCallback = bool Function();
 
 /// {@template keyboard_input_controller}
-/// A that receives keyboard input and execute registered methods
+/// A [Component] that receives keyboard input and executes registered methods.
 /// {@endtemplate}
 class KeyboardInputController extends Component with KeyboardHandler {
   /// {@macro keyboard_input_controller}

packages/pinball_components/test/src/components/backboard_test.dart

@@ -101,7 +101,7 @@ void main() {
 
       String? submitedInitials;
       tester.testGameWidget(
-        'submits the initial',
+        'submits the initials',
         setUp: (game, tester) async {
           final backboard = Backboard.gameOver(
             position: Vector2(0, 15),
@@ -147,7 +147,7 @@ void main() {
     );
 
     tester.testGameWidget(
-      "does nothing when don't have focus",
+      "does nothing when it doesn't have focus",
       setUp: (game, tester) async {
         await game.ensureAdd(
           BackboardLetterPrompt(position: Vector2.zero()),
@@ -162,7 +162,7 @@ void main() {
     );
 
     tester.testGameWidget(
-      'blinks the promp when have focus',
+      'blinks the prompt when it has the focus',
       setUp: (game, tester) async {
         await game.ensureAdd(
           BackboardLetterPrompt(position: Vector2.zero(), hasFocus: true),