docs: migrate stale rpk ai llm overrides to the renamed command

[JakeSCahill]

Summary

Flagged in review on docs-extensions-and-macros#225: every rpk docs regeneration prints override validation errors for rpk ai llm and rpk ai llm check — the rpai plugin renamed llm → llm-provider, so those entries silently do nothing.

• The provider-type note moves to rpk ai llm-provider (with openai-compatible added, matching the plugin's current config groups).
• The llm check description override is dropped: the renamed command's own help ("Runs a lightweight probe against the upstream to verify credentials and reachability") already covers it.

The remaining two validation errors (rpk cluster storage restore-start, rpk connect studio sync-schema) are left for their owners to triage — this PR only handles the rename casualties.

Related: the generator now surfaces these validation errors in automated PR bodies (docs-extensions-and-macros#225), so future stale entries won't hide.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8862ef4b-a976-4e28-b2c2-5da76b0c8053

📥 Commits

Reviewing files that changed from the base of the PR and between 32c36c6 and 335fd8c.

📒 Files selected for processing (1)

• docs-data/rpk-overrides.json

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📝 Walkthrough

Walkthrough

The documentation overrides rename rpk ai llm to rpk ai llm-provider. The supported provider list now includes openai-compatible. The rpk ai llm check command entry is removed.

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

Suggested reviewers: feediver1

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the changes and scope but omits the required Jira, review deadline, page preview, and checks sections.	Add the required template sections, including the Jira ticket, review deadline, page previews, and completed checks checklist.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the documentation fix for stale overrides after the rpk ai llm command rename.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cleanup/stale-rpk-ai-llm-overrides

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[JakeSCahill]

Closing in favor of #1865: verified that the provider-type enumeration now reaches the docs through extraction from the source help itself (rpk ai llm-provider and create both carry it, including openai-compatible), so the migration this PR performed would duplicate upstream content. Michele's drift argument is correct.