auto-docs: Update Admin API docs for v25.3.4

[vbotbuildovich]

This PR adds the latest OpenAPI spec for version v25.3.4 of the Redpanda Admin API:

npx doc-tools generate bundle-openapi --tag v25.3.4 --use-admin-major-version --surface admin --out-admin admin/admin-v2.yaml

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request updates the OpenAPI specification file admin/admin-v2.yaml with metadata and documentation improvements. The changes include bumping the x-redpanda-core-version from v25.3.2 to v25.3.3, updating the x-generated-at timestamp, and revising path operation descriptions and summaries across several endpoints (GetBroker, ListBrokers, ListKafkaConnections, ShadowLink operations). No changes are made to request/response schemas, endpoints, or the API surface.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

• Single file with metadata and documentation-only updates
• No functional, structural, or schema changes to verify
• Descriptions are straightforward and can be quickly scanned for accuracy and clarity

Possibly related PRs

• redpanda-data/api-docs#29: Introduces the initial full v2 OpenAPI spec file, which this PR now updates with refined metadata and operation descriptions.

Suggested reviewers

• kbatuigas
• paulohtb6

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The PR title accurately describes the main change: updating Admin API docs for a specific version (v25.3.4). It is clear, concise, and directly relates to the changeset.
Description check	✅ Passed	The description is related to the changeset, explaining the command used to generate the updated OpenAPI spec and specifying the version being added (v25.3.4).

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch auto-docs/admin-api

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