Add docs for button platform in Samsung Infrared

[lmaertin]

Proposed change

Add docs for button platform in Samsung Infrared

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 button platform for Samsung Infrared integration core#171791
• 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

Note

Copilot was unable to run its full agentic suite in this review.

This PR updates the Samsung Infrared integration documentation to reflect newly exposed button entities in addition to the existing media player entity.

Changes:

• Adds button to the integration’s declared supported platforms.
• Documents the set of button entities provided by the integration.
• Keeps the existing media player entity documentation under a dedicated section.