Add doc mention on climate_ir for Airton IR A/C units

[Procsiab]

Description:

This proposal I made in the same context of the linked pull request for the code to support the Airton protocol inside the climate component.

Related issue (if applicable): N/A Pull request in esphome with YAML changes (if applicable): esphome/esphome#7753

Checklist:

• [x] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /index.rst when creating new documents for new components or cookbook.

[netlify[bot]]

✅ Deploy Preview for esphome ready!

Name	Link
🔨 Latest commit	d5f2721d10684c80901f9e38fe0b5fe1872a71ab
🔍 Latest deploy log	https://app.netlify.com/sites/esphome/deploys/67371e2909a4db00086a17f8
😎 Deploy Preview	https://deploy-preview-4432--esphome.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.