Add cleaning fluid status description

[pauloruberto]

Proposed change

Added description for cleaning fluid status in Roborock integration.

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: Implement Roborock dock cleaning fluid status core#161098
• 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

This pull request adds documentation for a new cleaning fluid status binary sensor in the Roborock integration. The change supports an upcoming feature in Home Assistant core that adds monitoring capabilities for docks equipped with cleaning fluid functionality.

Changes:

• Added a new binary sensor entry "Cleaning fluid" with description for docks with cleaning fluid capabilities