cloud: add cloud release notes for release-20260915

[doc-claw-bot]

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

Add the reviewed TiDB Cloud Starter full-text search release note to the September 15, 2026 section, and keep the existing TiDB Cloud CLI public preview release note after it.

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 Starter full-text search now supports metadata filter pushdown, prefix and substring matching, and multi-column searches.
  • Tables can use multiple full-text indexes, with options to select indexes and parsers for greater query flexibility.

• Documentation

  • Updated the September 15, 2026 release notes with the latest full-text search capabilities.
  • Updated TiDB Cloud CLI links to point to the current Starter plan documentation.
  • Updated the TiDB Cloud CLI “Try” link to point to the AI documentation quick-start page.

[ti-chi-bot]

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Reviewing files that changed from the base of the PR and between 0344c8a and fafb47a.

📒 Files selected for processing (2)

• tidb-cloud/releases/tidb-cloud-release-notes.md
• tidb-cloud/starter/_index.md

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📝 Walkthrough

Walkthrough

The September 15, 2026 release notes add TiDB Cloud Starter full-text search capabilities and update the Starter link in the CLI announcement. The TiDB Cloud Starter page changes its CLI try-out link to the AI quick-start page.

Changes

TiDB Cloud documentation

Layer / File(s)	Summary
Release notes updates tidb-cloud/releases/tidb-cloud-release-notes.md	The release notes describe metadata filter pushdown, NGRAM matching, multi-column FTS_MATCH_WORD search, multiple full-text indexes, and parser and index-selection controls. The CLI announcement remains and uses an absolute Starter URL.
Starter navigation update tidb-cloud/starter/_index.md	The “Try Out TiDB Cloud CLI” link now points to the AI documentation quick-start page.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Suggested reviewers: qiancai

Merge Risk: ⚪ Minimal · up to fafb4

The documentation links resolve to their intended destinations, with no remaining actionable merge risk identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding TiDB Cloud release notes for the September 15, 2026 release.
Description check	✅ Passed	The description includes the required change summary, affected version, related links section, and change-type checklist. It omits the AI agent involvement section, but the description is otherwise su…
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.

✨ Finishing Touches

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• Create PR with unit tests

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Actionable comments posted: 1

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• tidb-cloud/releases/tidb-cloud-release-notes.md

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