docs: 📝 make instructions a bit more copy/paste friendly

Author: yjaaidi

docs/instructions/302-recipe-search-integration/1-test-bed.md

@@ -107,7 +107,7 @@ pnpm cook checkout-impl
 You can query one or multiple elements using, respectively, `query` and `queryAll` methods.
 
 ```ts
-const item = fixture.debugElement.query(By.css('.my-item')).nativeElement.textContent;
+const heading = fixture.debugElement.query(By.css('h2')).nativeElement.textContent;
 
-const items = fixture.debugElement.queryAll(By.css('.my-item')).map((el) => el.nativeElement.textContent);
+const headings = fixture.debugElement.queryAll(By.css('h2')).map((el) => el.nativeElement.textContent);
 ```

docs/instructions/303-recipe-search-shallow/1-test-bed.md

@@ -69,9 +69,9 @@ pnpm cook checkout-impl
 You can query one or multiple elements using, respectively, `query` and `queryAll` methods.
 
 ```ts
-const debugElement = fixture.debugElement.query(By.css('.my-item'));
+const heading = fixture.debugElement.query(By.css('h2'));
 
-const debugElements = fixture.debugElement.queryAll(By.css('.my-item'));
+const headings = fixture.debugElement.queryAll(By.css('h2'));
 ```
 
 ### 🎁 Tip: Access element properties