Update from code changes: describe llms.txt v2 scoped indexes

[mintlify-development]

Summary

Update the llms.txt docs to describe the new v2 layout: scoped child indexes served under /_llms/<scope>.md, and the ## Indexes directory that the root llms.txt now emits for large sites.

Changes

• Correct the 100k-character note so it reflects that Mintlify splits the index into scoped files instead of dropping tail pages.
• Add a new "Scoped indexes for large sites" section explaining the /_llms/<scope>.md path, how scopes are chosen (navigation subtree, then URL path segment for large flat sections), the root ## Indexes directory with breadcrumbs and unique page counts, and the recursive-follow instruction for AI tools.
• Include an example of the rendered ## Indexes section.
• Mirror the same updates in es/, fr/, and zh/ translations.

Context

Follows mintlify/mint#10207, #10264, #10329, #10366 and mintlify/server#7654, which introduced the v2 planner/renderer, URL-segment grouping, scoped index route, and the root Indexes directory.

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Note

Low Risk
Documentation-only changes to llms.txt guides; no runtime, auth, or data-handling code is modified.

Overview
Updates the llms.txt documentation (and es, fr, zh locales) to match the v2 index layout for large sites.

The 100k-character note now states that Mintlify splits oversized indexes into scoped child files at /_llms/<scope>.md so no pages are dropped, and that the cap applies to any single index file, not only the root.

A new Scoped indexes for large sites section documents how scopes are chosen (navigation subtrees first, then URL path segments for large flat sections), the root ## Indexes directory with breadcrumbs, page counts, and recursive-follow instructions for AI tools, plus an example block. Reverse-proxy guidance for /_llms/* was already present and remains in place after the new section.

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