Document unsupported reason 'os_version'

[mdegat01]

Proposed change

Document new unsupported reason os_version added in home-assistant/supervisor#6041

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 unsupported reason os_version and evaluation supervisor#6041
• 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.

[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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[mdegat01]

Parent PR is in supervisor repository so current is correct.

[c0ffeeca7]

Thank you, @mdegat01 👍

[Copilot]

Pull Request Overview

This PR documents a new unsupported reason os_version by creating a dedicated page that explains why installations running old versions of Home Assistant Operating System are marked as unsupported and provides guidance on how to resolve the issue.

• Adds documentation for the os_version unsupported reason introduced in supervisor PR #6041
• Explains the 4-major-version support policy for Home Assistant Operating System
• Provides clear instructions for updating the operating system

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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