Document llms.txt description truncation

[mintlify-development]

Summary

• Documents that descriptions in llms.txt are truncated to the first paragraph and capped at 300 characters with an ellipsis

Triggered by mintlify/server#4008 which adds description sanitization for llms.txt files.

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Note

Low Risk
Low risk documentation-only change that clarifies how llms.txt descriptions are generated, with no functional code changes.

Overview
Updates the ai/llmstxt.mdx documentation to explicitly state that llms.txt page descriptions are truncated when over 300 characters (using the first paragraph) and capped at 300 characters with an ellipsis, while keeping the existing behavior notes for API reference descriptions and missing description frontmatter.

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