Add Door cover documentation

[Dexwell]

Resolves home-assistant/core#80741

Proposed change

Adds info about the Door cover type.

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 HomeKit Door accessory type core#80741
• This PR fixes or closes issue: fixes Add HomeKit Door accessory type core#80741

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.

[home-assistant]

It seems that this PR is targeted against an incorrect branch since it has a parent PR on one of our codebases. Documentation that needs to be updated for an upcoming release should target the next branch. Please change the target branch of this PR to next and rebase if needed.

[frenck]

@Dexwell Unless there is a merge conflict, there is no need to constantly update your branch (all it does it generate unneeded notifications and waste CI build time).

[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.