Update Docs, add notes for general and serve/funnel configuration

[lmagyar]

Proposed Changes

Users who commit these mistakes usually don't read docs, at least we can point to it. :/

Related Issues

Summary by CodeRabbit

• Documentation
  • Updated key expiry configuration documentation with a note to restart the app after changes.
  • Clarified that provided YAML configuration is an example and not the default.
  • Added note explaining that Tailscale Serve and Funnel automatically update certificates before expiration.

[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

Run ID: 8440fd49-df3b-445f-905a-fa73f5c5531c

📥 Commits

Reviewing files that changed from the base of the PR and between 02fbebc and 62b3d78.

📒 Files selected for processing (1)

• tailscale/DOCS.md

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Walkthrough

Documentation additions to the Tailscale configuration guide covering key expiry restart requirements, YAML example status clarification, and automatic certificate update behavior for Serve/Funnel functionality.

Changes

Cohort / File(s)	Summary
Documentation Updates tailscale/DOCS.md	Added restart instruction for key expiry configuration changes, warning that provided YAML is an example not default, and note that Serve/Funnel automatically updates certificates before expiration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• frenck

Poem

🐰 A documentation hop,
Nine lines of clarity won't stop,
Restart! Update! Don't delay,
Certs refresh the Tailscale way,
Knowledge blooms where docs take flight! ✨

🚥 Pre-merge checks | ✅ 3

✅ 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 accurately describes the main changes: documentation updates with added notes for general and serve/funnel configuration, matching the file modifications in tailscale/DOCS.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[lmagyar]

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