Docs: missing parenthesis on example (#37156)

Missing close parenthesis on docs example from page custom-document-image-import.md

## Bug

- [x] Related issues linked using `fixes #37155`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`


Co-authored-by: JJ Kasper <22380829+ijjk@users.noreply.github.com>

errors/custom-document-image-import.md

@@ -14,15 +14,16 @@ If your image needs to be displayed on every page you can relocate it to your [`
 
 ```jsx
 //pages/_app.js
-import yourImage from "path/to/your/image"
-import Image from "next/image"
+import yourImage from 'path/to/your/image'
+import Image from 'next/image'
 
 function MyApp({ Component, pageProps }) {
  return (
  <>
  <Image src={yourImage} alt="your_image_description" />
  <Component {...pageProps} />
  </>
+ )
 }
 
 export default MyApp