Update old broken links to current links in the documentation.

[trollLemon]

• Have you updated CHANGELOG.md with relevant non-documentation file changes?
• Have you updated the documentation for this change?

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[Copilot]

Copilot review overview

🟢 Approval recommended

Documentation-only link updates were fully reviewed with no unresolved issues.

Review effort: Lite
Findings: None

What changed in this PR

Updates outdated Ubuntu wiki links in Livepatch documentation to current kernel documentation.

Changes:

• Updated HWE kernel guidance links.
• Updated kernel updates reference links.
• Preserved surrounding content and formatting.

File	Description
docs/​client/​explanation/​troubleshooting/​why-livepatch-is-not-working-on-my-machine.md	Updates the HWE kernel documentation link.
docs/​client/​explanation/​architecture/​what-kind-of-updates-are-not-provided-by-livepatch.md	Updates the kernel updates documentation link.

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[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed documentation changes are complete with no unresolved issues.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🔵 Needs a closer look

Migration instructions must handle the reactive charm’s model and password retrieval workflow correctly.

Review effort: Lite
Findings: None

Previously missed (1)

In code that hasn't changed since last review

Switch to the machine-charm model before retrieving the database secret

docs/​server/​how-to-guides/​deployment/​migrate-from-reactive-charm-to-k8s-operator-charm.md:147

The guide switches to the Livepatch K8s deployment in step 52, but this section is reading the old machine-charm database. Without switching back, juju secrets and juju show-secret run against the K8s model and cannot find the source postgresql application's secret. Please explicitly switch to the machine-charm model here, or pass that model to both commands.

[Copilot]

Copilot review overview

🟡 Changes recommended

The migration guide leaves subsequent Juju commands targeting the wrong model.

Review effort: Lite
Findings: 1

Open (1)

• Restore the K8s Juju model before running subsequent commands · New