v8.5.5 br: remove outdated PITR limitation (#22262)

[ti-chi-bot]

This is an automated cherry-pick of #22262

What is changed, added or deleted? (Required)

This PR is a follow-up to #21109.

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• v8.1 (TiDB 8.1 versions)
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What is the related PR or file link(s)?

• This PR is translated from: br: remove outdated PITR limitation docs-cn#21238
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Do your changes match any of the following descriptions?

• Delete files
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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 updates the backup and restore documentation by removing an obsolete restriction related to Point-in-Time Recovery (PITR). The change ensures that the documentation accurately reflects the current capabilities of the system, providing users with correct information regarding PITR's functionality beyond just cluster-level restores.

Highlights

• Documentation Update: Removed an outdated limitation from the backup and restore documentation, specifically the statement that Point-in-Time Recovery (PITR) only supports cluster-level restore.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to remove an outdated restriction on Point-in-Time Recovery (PITR), correctly reflecting that it is no longer limited to cluster-level restores. While removing the restriction is a good step, the documentation would be more helpful to users if it also included instructions on how to perform database-level or table-level restores with PITR.

[lilin90]

/approve

[lilin90]

/hold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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• OWNERS [lilin90]

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[lilin90]

/unhold