tikv-client: add resolve-lock-lite-threshold description

[lcwangchao]

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new resolve-lock-lite-threshold configuration item in tidb-configuration-file.md. The review feedback suggests improving the clarity and conciseness of the description by using 'less than' instead of 'smaller than' and simplifying the phrasing, which aligns with the documentation style guide.

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