Update HomeKit Device documentation

[LeoCal]

After the renaming of "HomeKit Controller" integration to "HomeKit Device", some parts of the documentation still contain a mix of old and new naming. This might result confusing for the end-user, hence fixing this with this PR.

Proposed change

Fixing leftovers in "HomeKit Device" documentation from old "HomeKit Controller" that make it confusing for the end user.

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

After the renaming of "HomeKit Controller" integration to "HomeKit Device", some parts of the documentation still contain a mix of old and new naming. This might result confusing for the end-user, hence fixing this with this PR.

• Link to parent pull request in the codebase:
• 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.

[frenck]

Thanks, @LeoCal 👍

../Frenck