tikv: add max-ts configuration docs for v8.5.7

[ekexium]

What is changed, added or deleted? (Required)

Document the TiKV storage.max-ts configuration section for v8.5.7 on the release-8.5 branch, including:

• action-on-invalid-update
• cache-sync-interval
• max-drift

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

What is the related PR or file link(s)?

• TiKV PR: storage: add max ts invalid update action config tikv/tikv#19756
• Issue: tikv panic with "invalid max_ts update: 467212680882290688 exceeds the limit 467212680882028621, source=scan_lock" when run dr-auto-sync switch with cdc tikv/tikv#19755

Do your changes match any of the following descriptions?

• Configuration changes
• API changes
• SQL syntax changes
• Error code changes
• Others

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[Copilot]

Pull request overview

This PR updates the TiKV configuration documentation to cover the new storage.max-ts configuration section introduced for the TiDB v8.5 (release-8.5) line, specifically targeting v8.5.7.

Changes:

• Added a new ## storage.max-ts section describing what max-ts is and why it matters for Async Commit / 1PC correctness.
• Documented the new storage.max-ts options: action-on-invalid-update, cache-sync-interval, and max-drift.

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