i18n(ja): fix garbled Tip link in tidb-cloud/backup-and-restore.md

[yahonda]

What is changed, added or deleted? (Required)

Fix a garbled Tip link in tidb-cloud/backup-and-restore.md. The machine translation duplicated the link text and left a stray closing quote (」) after the link:

Before:

> ...インスタンスでデータをバックアップおよび復元する方法については、 [TiDB Cloud StarterまたはEssentialでデータをバックアップおよび復元する](/tidb-cloud/backup-and-restore-serverless.md)および復元する」を参照してください。

After:

> ...インスタンスでデータをバックアップおよび復元する方法については、 [TiDB Cloud StarterまたはEssentialでデータをバックアップおよび復元する](/tidb-cloud/backup-and-restore-serverless.md)を参照してください。

The spurious および復元する」 after the link's closing ) is removed, matching the single clean link in the English source (... see [Back Up and Restore Data on {{{ .starter }}} or Essential](/tidb-cloud/backup-and-restore-serverless.md).). One line, one file.

The Japanese callout label on the line above (> **ヒント**) is intentionally left untouched here; it is handled by the separate admonition-label normalization work.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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

• This PR is translated from: N/A (Japanese-only fix; no English source change)
• Other reference link(s): part of the i18n-ja-release-8.5 machine-translation cleanup series

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

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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