Add media player entities section to Shelly documentation

[bieniu]

Proposed change

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: Support media player for Shelly Wall Display core#168494
• 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

Adds documentation for Shelly Wall Display media player support, aligning the Shelly integration page with new media player entities introduced in Home Assistant Core (linked parent PR).

Changes:

• Added Media player to the Shelly integration ha_category metadata.
• Added media_player to the Shelly integration ha_platforms metadata.
• Documented Wall Display media player entities and provided media_player.play_media action examples for radio favorites and local audio.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[c0ffeeca7]

Thank you, @bieniu and @thecode 👍