i18n(ja): restore dropped negation in Private Endpoint firewall limitation

[yahonda]

What is changed, added or deleted? (Required)

Fix a dropped negation in tidb-cloud/serverless-limitations.md line 24. The English source states a limitation:

No Firewall Rules support for Private Endpoint.

The Japanese translation dropped the "No", producing a garbled, seemingly affirmative fragment:

Before:

プライベートエンドポイントのサポートファイアウォールルール 。

After:

プライベートエンドポイントはファイアウォールルールをサポートしていません。

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

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s):

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

Summary by CodeRabbit

• Documentation
  • Clarified the Japanese documentation to state that private endpoints do not support firewall rules.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b1f679 and ed3f712.

📒 Files selected for processing (1)

• tidb-cloud/serverless-limitations.md

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📝 Walkthrough

Walkthrough

The serverless limitations documentation corrects the connection limitation text. It now states that private endpoints do not support firewall rules.

Changes

Serverless documentation

Layer / File(s)	Summary
Clarify connection limitation tidb-cloud/serverless-limitations.md	The connection limitation bullet now clearly states that private endpoints do not support firewall rules.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to ed3f7

The Japanese Serverless limitation now correctly states that Private Endpoints do not support Firewall Rules. The documentation correction is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: restoring the missing negation in the Japanese Private Endpoint firewall limitation.
Description check	✅ Passed	The description explains the file change, the reason for the change, the before-and-after text, the affected documentation branch, and AI involvement. The related-link fields are empty, but the requir…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the file change, the reason for the change, the before-and-after text, the affected documentation branch, and AI involvement. The related-link fields are empty, but the required information is otherwise complete.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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