Update from code changes: Markdown 404 recovery guidance

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Summary

Missing pages requested as Markdown now return a 404 with a Markdown body that helps AI tools recover. The response links to the documentation index (llms.txt), the full documentation file (llms-full.txt), and up to three related pages based on the requested path. Sites that use authentication omit suggestions and return only the documentation links. The Link and X-Llms-Txt discovery headers now also appear on Markdown responses and 404 pages. See https://github.com/mintlify/mint/pull/10806.

Changes

• Added a "Missing pages" section to /ai/markdown-export with an example Markdown 404 response.
• Updated /ai/llmstxt to note that discovery headers appear on Markdown responses and 404 pages.
• Mirrored both updates in the es, fr, and zh translations.

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Note

Low Risk
Documentation-only changes with no runtime or security impact.

Overview
This PR updates the AI docs to match platform behavior from mint#10806: Markdown 404 recovery and broader discovery headers.

Markdown export now documents a Missing pages section: requesting a non-existent page as Markdown returns 404 with a Markdown body that points agents at llms.txt, llms-full.txt, and up to three related pages (same search as the custom 404 page). Authenticated sites only return the index links, not related suggestions. An example response is included.

llms.txt clarifies that Link and X-Llms-Txt discovery headers are sent on every response, not just normal HTML pages—specifically including Markdown responses and 404 pages.

The same content updates are mirrored in es, fr, and zh (markdown-export and llmstxt).

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