fritzbox: document "open window" switch

[kugel-]

Documentation pieces for the new "open window" switch (home-assistant/core#167125)

Proposed change

(from home-assistant/core#167125)
The new "open window" switch can be used from automations to indicate an open window (e.g. based on actual window sensors as in my case) . The "open window" detection (triggered manually via API) plays better with comfort/eco schedules.

Currently one can only use the "off" hvac mode which can be cancelled too early (by the device itself) if interrupted by a schedule transition.

Since the API requires an endtime this can be configured separately, using a number entity. The value will be used when turning the switch on.

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: fritzbox: Add "open window" switch for climate devices core#167125

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.

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[Copilot]

Pull request overview

This pull request adds documentation for a new "open window" switch entity in the FRITZ!SmartHome integration. The feature allows users to manually indicate an open window via automations, which works better with comfort/eco schedules than using the "off" HVAC mode.

Changes:

• Added {% term switch %} to the list of entity types available for thermostats
• Added "Manual open window indication (in combination with distinct window sensors)" to the list of available entities for thermostats