Document 300-character description truncation in llms.txt

[mintlify]

Summary

• Added documentation that descriptions in llms.txt are truncated to the first 300 characters when they exceed that limit
• Updated English, Chinese, French, and Spanish documentation pages

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Note

Low Risk
Documentation-only wording updates that clarify existing llms.txt behavior; no runtime or API changes.

Overview
Clarifies in the llms.txt docs that page description values are truncated to the first 300 characters when longer than that limit.

Applies the same clarification across the English, Spanish, French, and Chinese versions of the llms.txt documentation pages.

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