fix(docs): broken link to AI Middleware docs

[cweekly]

previous link 404s, there's no "AI Middleware Guide" but there is this docs page: https://tanstack.com/ai/latest/docs/advanced/middleware

Summary by CodeRabbit

• Documentation
  • Updated the middleware documentation link in the TanStack AI middleware article.

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Latest commit: 5b7d0bf

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 85a0768e-88e7-4e7e-9aa7-374d091f3eed

📥 Commits

Reviewing files that changed from the base of the PR and between e36d5f3 and 5b7d0bf.

📒 Files selected for processing (1)

• src/blog/tanstack-ai-middleware.md

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📝 Walkthrough

Walkthrough

The TanStack AI middleware article now links to /docs/advanced/middleware with the label “Middleware docs.”

Changes

Middleware documentation link

Layer / File(s)	Summary
Update documentation link src/blog/tanstack-ai-middleware.md	The link now targets /docs/advanced/middleware and uses the label “Middleware docs.”

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 5b7d0

The article now links to the intended middleware documentation, so readers can reach the referenced guide. No merge-blocking issue remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the change: fixing a broken link to the AI Middleware documentation.

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