Add file validation section to llms.txt docs

[mintlify]

Summary

• Adds a "Validate your files" section to the llms.txt documentation page, pointing users to mint score for checking quality of both llms.txt and llms-full.txt files.

What shipped

The mint score command now validates llms-full.txt files in addition to llms.txt, checking that the file is reachable, well-structured, appropriately sized, and that embedded links resolve correctly. This documentation update connects the existing llms.txt docs to the mint score validation feature so users know how to verify their files.

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Note

Low Risk
Low risk documentation-only change that adds a reference to an existing CLI command; no runtime or behavioral code changes.

Overview
Adds a new "Validate your files" section to the llms.txt docs, directing users to run mint score to validate both llms.txt and llms-full.txt (reachability, structure/size, and link resolution).

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