docs: update broken link in UPGRADING.md (#60342)

This link →
[/docs/02-app/01-building-your-application/09-upgrading/index.mdx](21452921c0/docs/02-app/01-building-your-application/09-upgrading/index.mdx)
doesn't exist.

Fixing it to link to the correct directory.

Closes NEXT-2006
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Sam Ko 2024-01-06 14:46:07 -08:00 committed by GitHub
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commit 6568502dcf
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@ -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/09-upgrading/index.mdx](/docs/02-app/01-building-your-application/09-upgrading/index.mdx). 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).