Add sensor platform to Actron Air integration documentation

[kclif9]

Proposed change

Adds the sensor platform to the Actron Air integration documentation.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add sensor platform to the actron air integration core#169553
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

Updates the Actron Air integration documentation to reflect that the integration now provides sensor entities, aligning the docs with the new feature in Core (linked parent PR).

Changes:

• Added sensor to the ha_platforms front matter list.
• Documented the new sensor entities exposed by the integration (air conditioner sensors and per-peripheral sensors).