pd: complement pd section (#21204)

[ti-chi-bot]

This is an automated cherry-pick of #21204

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• This PR is translated from: pd: complement pd section docs-cn#20500
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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the documentation for TiDB's Placement Driver (PD) by adding new dynamic configuration parameters and providing detailed descriptions for them. The changes aim to ensure that users have up-to-date and comprehensive information regarding PD's configurable aspects, improving clarity and usability of the documentation.

Highlights

• Documentation Update: Dynamic PD Configuration: I've updated the dynamic-config.md file to include several new dynamic PD configuration parameters across schedule, replication, pd-server, and replication-mode.dr-auto-sync sections. This ensures the documentation accurately reflects the latest configurable options.
• New Configuration Parameter Description: I've added a detailed description for the schedule.max-movable-hot-peer-size parameter in pd-configuration-file.md, including its purpose, default value, and unit, providing clearer guidance for users.
• Documentation Refinement: I've refined the dynamic-config.md table by adding schedule.max-store-preparing-time and re-positioning schedule.patrol-region-worker-count to maintain consistency and accuracy in the listed parameters.

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[gemini-code-assist]

Code Review

This pull request complements the PD configuration documentation by adding new configuration items and details. The changes are clear and follow the documentation style.