Add documentation for BSB-Lan hot water schedule action and examples

[liudger]

Proposed change

This pull request adds documentation for a new action to the BSB-Lan integration, enabling users to set hot water heating schedules via Home Assistant automations. It also provides detailed usage examples for configuring schedules for different days and automating schedule changes based on the season.

New features and documentation:

• Added documentation for the bsblan.set_hot_water_schedule action, including its required data attributes and supported schedule format.
• Included YAML examples demonstrating how to set weekday/weekend schedules and how to automate schedule changes for different seasons.

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: Add service for setting hot water schedule core#156112
• 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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Pull Request Overview

This PR adds documentation for a new action bsblan.set_hot_water_schedule to the BSB-Lan integration. The action allows users to configure hot water heating schedules for different days of the week with specific time periods. The documentation includes parameter descriptions and two practical examples: a basic weekday/weekend schedule and a seasonal automation that adjusts schedules based on the season.

Key changes:

• Added Actions section documenting the bsblan.set_hot_water_schedule action
• Included parameter documentation for device and schedule configuration
• Provided two example use cases with YAML automation code