restore: add faq for rule not found (#16091)

[ti-chi-bot]

This is an automated cherry-pick of #16091

What is changed, added or deleted? (Required)

Translate docs cn pr#14383

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• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
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• 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: restore: add faq for rule not found docs-cn#14383
• 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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[ran-huang]

closing because the modified file doesn't exist in release 5.4