improve: Explain wake up action is disabled by default and how to enable it

[PedroKTFC]

If you look just at the api documentation you don't realise that the wake up action isn't enabled by default and so won't be available. This pull request provides clarification.

Summary by CodeRabbit

• Documentation
  • Clarified that the wake_up action is disabled by default.
  • Added instructions for enabling it through the ESPHome YAML configuration.

[coderabbitai]

📝 Walkthrough

Walkthrough

The API documentation now states that the wake_up action is disabled by default and requires include_action_wake_up: true in ESPHome substitutions.

Changes

Wake Up Action Documentation

Layer / File(s)	Summary
Document wake_up enablement docs/api.md	The wake_up action documentation explains its default-disabled status and YAML configuration required to enable it.

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

Suggested reviewers: edwardtfn

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the documentation change about the wake up action being disabled by default and how to enable it.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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