fix highlighting

Closes #62

Author: kentcdodds

exercises/07.error-handling/02.problem.thrown-response/README.mdx

@@ -112,7 +112,7 @@ export async function requireUser(request: Request) {
 This is a great way to make nice utilities that make the regular application
 code much easier to write and read:
 
-```tsx filename=app/routes/sandwiches.$sandwichId.tsx add=8,17 remove=7,12-16
+```tsx filename=app/routes/sandwiches.$sandwichId.tsx add=8,17 remove=9-12,18-21
 import { json, type DataFunctionArgs, type MetaFunction } from '@remix-run/node'
 import { invariantResponse, useIsSubmitting } from '#app/utils/misc.tsx'
 import { getUser } from '#app/utils/auth.server'