v8.5.5 br: pitr restore mode (#21254)

[ti-chi-bot]

This is an automated cherry-pick of #21254

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• This PR is translated from: br: pitr restore mode docs-cn#20559
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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 enhances the TiDB Backup and Restore (BR) documentation by providing crucial details on how table modes behave during data restoration processes. The added information clarifies the temporary restore state of tables, which is essential for maintaining data integrity and operational stability during recovery, ultimately improving user understanding of the BR feature.

Highlights

• Documentation Update: Added a new section to both the Point-in-Time Recovery (PITR) and snapshot restore guides, explaining the restore table mode. This clarifies that tables enter a restore mode during data restoration, preventing read/write operations, and automatically revert to normal mode upon completion, ensuring data consistency and task stability.

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[gemini-code-assist]

Code Review

This pull request adds a note to the PITR and snapshot restore guides explaining the restore table mode. My review focuses on improving the clarity and style of the new documentation paragraph to align with the repository's style guide. I've suggested using active voice and addressing the user directly for better readability.