cloud: update tidb-cloud-kernel-versioning.md

[qiancai]

What is changed, added or deleted? (Required)

Remove a version FAQ from tidb-cloud/releases/tidb-cloud-kernel-versioning.md

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

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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 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)

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• 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
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• Need modification after applied to another branch
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Summary by CodeRabbit

• Documentation
  • Updated the TiDB Cloud FAQ by removing outdated kernel version checking instructions.
  • Simplified the kernel version selection FAQ to provide a direct answer.

[coderabbitai]

📝 Walkthrough

Walkthrough

The TiDB Cloud kernel versioning FAQ removes instructions for checking a Premium instance’s kernel version and shortens the kernel selection answer to state that selection is unavailable.

Changes

Kernel versioning FAQ

Layer / File(s)	Summary
FAQ content update tidb-cloud/releases/tidb-cloud-kernel-versioning.md	Removes kernel version checking steps and explanatory text from the kernel selection entry, leaving only the direct answer that kernel selection is unavailable.

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

Possibly related PRs

• pingcap/docs#23147: Adds the FAQ page whose content is updated here.

Suggested labels: area/tidb-cloud

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title clearly identifies the updated file and matches the documentation change.
Description check	✅ Passed	The PR description covers the change and affected version, with the required sections present despite empty reference fields.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[qiancai]

/approve

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