docs: Adjust Bird constructor

site/docs/00-tutorial/08-step-periodic-pipes.mdx

@@ -104,7 +104,7 @@ import { PipeFactory } from './pipe-factory';
 export class Level extends ex.Scene {
     random = new ex.Random();
     pipeFactory = new PipeFactory(this, this.random, Config.PipeInterval);
-    bird = new Bird(this);
+    bird = new Bird();
     ground!: Ground;
 
     onInitialize(engine: ex.Engine): void {

site/docs/00-tutorial/09-step-scoring-points.mdx

@@ -149,7 +149,7 @@ You might notice that sometimes the score double counts sometimes! Well this is
 
 export class Bird extends ex.Actor {
     ...
-    constructor(private level: Level) {
+    constructor() {
         super({
             pos: Config.BirdStartPos,
             // width: 16,
@@ -161,4 +161,4 @@ export class Bird extends ex.Actor {
   ...
 }
 
-```
+```

site/docs/00-tutorial/10-step-game-over.mdx

@@ -63,12 +63,13 @@ export class Level extends ex.Scene {
 }
 ```
 
-In our `Bird` we want to trigger this game over when it leaves the screen and when it collides with a `Pipe` or the `Ground`
+In our `Bird` we want to trigger this game over when it leaves the screen and when it collides with a `Pipe` or the `Ground`, so we'll pass in the instance of the `Level` so we can call it's `triggerGameOver()`.
 
 ```typescript
 // bird.ts
 export class Bird extends ex.Actor {
     playing = false;
+    constructor(private level: Level) { ... }
     ...
 
     override onInitialize(): void {