docs: update broken link in UPGRADING.md (vercel#70107)

## Description
At vercel#60388, upgrading.md was moved.
Then update the link to correct directory.

❌
[/docs/02-app/01-building-your-application/10-upgrading](https://github.com/vercel/next.js/blob/canary//docs/02-app/01-building-your-application/10-upgrading)
✔️
[/docs/02-app/01-building-your-application/11-upgrading](https://github.com/vercel/next.js/blob/canary//docs/02-app/01-building-your-application/11-upgrading)

### Improving Documentation

- [x] Run `pnpm prettier-fix` to fix formatting issues before opening
the PR.
- [x] Read the Docs Contribution Guide to ensure your contribution
follows the docs guidelines:
https://nextjs.org/docs/community/contribution-guide

x-ref: vercel#60388 

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Co-authored-by: JJ Kasper <[email protected]>

UPGRADING.md

@@ -1 +1 @@
-This document has been moved to [nextjs.org/docs/upgrading](https://nextjs.org/docs/upgrading). It's also available in this repository on [/docs/02-app/01-building-your-application/10-upgrading](/docs/02-app/01-building-your-application/10-upgrading).
+This document has been moved to [nextjs.org/docs/upgrading](https://nextjs.org/docs/upgrading). It's also available in this repository on [/docs/02-app/01-building-your-application/11-upgrading](/docs/02-app/01-building-your-application/11-upgrading).