01/01: fix wrong highlight in solution

Author: kettanaito

exercises/01.sunsetting-jsdom/01.solution.break-jsdom/README.mdx

@@ -2,7 +2,7 @@
 
 I start with rendering the `<FilePreview />` component in my test:
 
-```tsx add=1,4
+```tsx add=1,5
 import { test, expect } from 'vitest'
 import { render, screen } from '@testing-library/react'
 import { FilePreview } from './file-review.js'