fix: Minor corrections to the cert-manager certificate being used for the Agent in docs

[gnunn1]

What does this PR do / why we need it:

Fixes a couple of minor issues with the Agent instructions for cert-manager, specifically:

• Suffixes the secret with -principal in the certificate since later instructions rely on that
• Fixes the hardcoded managed-cluster for the commonName, this should be the cluster-name

Which issue(s) this PR fixes:

None

How to test changes / Special notes to the reviewer:

Follow instructions for using cert-manager for PKI

Checklist

• Documentation update is required by this PR (and has been updated) OR no documentation update is required.

Summary by CodeRabbit

• Documentation
  • Updated PKI certificate configuration examples to use revised naming conventions: secret names, certificate common names, and corresponding CLI sample commands now reflect the new cluster-specific identifiers.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Updated documentation example for PKI certificates: spec.secretName now uses <cluster-name>-principal, spec.commonName now uses <cluster-name>, and a CLI output example references kubectl get secret <cluster-name>-agent ....

Changes

Cohort / File(s)	Summary
PKI Certificate Configuration Documentation docs/configuration/agent/pki-certificates.md	Adjusted example Certificate manifest values: spec.secretName changed from <cluster-name> to <cluster-name>-principal; spec.commonName changed from managed-cluster to <cluster-name>; CLI output example updated to reference <cluster-name>-agent secret.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single documentation file; only example value updates.
• No code, API, or behavioral changes.

Suggested reviewers

• jannfis
• jgwest
• chetan-rns
• mikeshng

Poem

🐰 I hopped through docs with nimble feet,

Names aligned — now tidy and neat,
Secrets and CNs in proper place,
No more mismatched, a cleaner space,
🥕 Hooray for clarity, a happy trace!

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the main change: minor corrections to certificate documentation for the Agent using cert-manager, which aligns with the file changes updating secret names and commonName references.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2a34d37 and be12f46.

📒 Files selected for processing (1)

• docs/configuration/agent/pki-certificates.md (3 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/configuration/agent/pki-certificates.md

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: Build and push image
• GitHub Check: Analyze (go)

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[gnunn1]

Please don't merge this yet, I need to look at this one more time with a clear head.