pitr: update limitation of first time restore

[enkilee]

First-time contributors' checklist

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What is changed, added or deleted? (Required)

fix #15438

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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

• This PR is translated from: pitr: update limitation of first time restore. docs-cn#15438
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[enkilee]

/label 2024-tidb-docs-dash

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-09 08:15:52.434644791 +0000 UTC m=+344742.018898477: ☑️ agreed by dveeden.
• 2024-01-22 03:10:35.334791795 +0000 UTC m=+757476.899089499: ☑️ agreed by hfxsd.

[hfxsd]

/approve

[ti-chi-bot]

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This pull-request has been approved by: hfxsd

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16203.