docs: fix proxy matcher overflow

[icyJoseph]

Also closes: #85344

[github-actions]

All broken links are now fixed, thank you!

[vercel]

Suggested change

	> - Proxy uses the Node.js runtime, check if your Auth library and session management library are compatible. You may need to use [Middleware](https://github.com/vercel/next.js/blob/v15.5.6/docs/01-app/03-api-reference/03-file-conventions/middleware.mdx) if your Auth library only supports [Edge Runtime](/docs/app/api-reference/edge)
	> - Proxy uses the Node.js runtime, check if your Auth library and session management library are compatible. You may need to use [Proxy](/docs/app/api-reference/file-conventions/proxy) if your Auth library only supports [Edge Runtime](/docs/app/api-reference/edge)

Line 1124 contains a broken GitHub link to deprecated middleware documentation. The link should reference the internal documentation for Proxy instead: /docs/app/api-reference/file-conventions/proxy.

View Details

Analysis

Broken documentation link in authentication guide

What fails: Line 1124 in docs/01-app/02-guides/authentication.mdx contains an incorrect documentation link pointing to a GitHub URL for deprecated middleware documentation.

How to reproduce:

• Open docs/01-app/02-guides/authentication.mdx
• Navigate to line 1124
• The link text reads [Middleware](https://github.com/vercel/next.js/blob/v15.5.6/docs/01-app/03-api-reference/03-file-conventions/middleware.mdx)

What happened vs expected behavior:

• The link pointed to a GitHub blob URL targeting a non-existent middleware.mdx file (deprecated in favor of proxy)
• Expected: Link should point to the internal documentation path /docs/app/api-reference/file-conventions/proxy and display [Proxy] as the link text
• The pattern matches existing correct usage at line 1026 in the same file

Fix applied: Changed line 1124 from:

[Middleware](https://github.com/vercel/next.js/blob/v15.5.6/docs/01-app/03-api-reference/03-file-conventions/middleware.mdx)

to:

[Proxy](/docs/app/api-reference/file-conventions/proxy)

[icyJoseph]

For the time being, I reckon we need to link to some documentation about Middleware for those who are using Edge runtime.