cloud: add cloud release notes for release-20260922

[doc-claw-bot]

What is changed, added, or deleted? (Required)

Add the September 22, 2026 TiDB Cloud release note entry for inbound IPv6 connectivity over AWS PrivateLink for TiDB Cloud Dedicated.

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

• v8.5

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

None

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

• New Features
  • TiDB Cloud Dedicated now supports inbound IPv6 connectivity through AWS PrivateLink.
  • Connect using either IPv4 or IPv6.
  • Request access through TiDB Cloud Support.
  • Create an AWS interface endpoint with the IP address type set to dualstack.
  • Refer to the IPv6 private endpoint documentation for setup guidance.

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📝 Walkthrough

Walkthrough

Changes

IPv6 PrivateLink documentation

Layer / File(s)	Summary
IPv6 connectivity release note tidb-cloud/releases/tidb-cloud-release-notes.md	Adds a September 22, 2026 entry for inbound IPv6 connectivity over AWS PrivateLink. The note specifies TiDB Cloud Support contact, an AWS interface endpoint with the IP address type set to dualstack, and a documentation link.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: qiancai

Merge Risk: 🔵 Low · up to bc11a

The documentation may misstate version availability and leave users unable to configure IPv6 successfully; these bounded documentation issues should be corrected before or alongside merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the TiDB Cloud release-note update and its release date. It is concise and related to the primary change.
Description check	✅ Passed	The description includes the required change summary, affected version, related-link section, and change-type checklist. The optional first-time contributor checklist and AI agent involvement section …
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.

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🧪 Generate unit tests (beta)

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-09-22 08:58:49.433947277 +0000 UTC m=+95254.659168384: ☑️ agreed by lilin90.

[qiancai]

/approve

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This pull-request has been approved by: qiancai

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