Update documentation add MQTT suggested_area

[RadekHvizdos]

Add MQTT suggested_area to the documentation

Proposed change

This adds suggested_area to MQTT discovery, so that the discovered devices could be automatically added to the proper area.

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 logo's 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 suggested_area to MQTT discovery core#47903
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue:

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.

[homeassistant]

Hi @RadekHvizdos,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[RadekHvizdos]

Need to update the next branch, not current. Closing this PR and raising new one for next branch