Change the disable subdomain isolation property to false

[vinokurig]

What does this pull request change?

• Change the disable subdomain isolation property to false as most of GitHub server instances are running with enabled subdomain isolation property and it is recommended to enable the subdomain isolation in the GitHub setup page.
• Wrap the false value in braces in order to meet the yaml format.

What issues does this pull request fix or reference?

fixes eclipse-che/che#22813

Specify the version of the product this pull request applies to

next

Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • Successfully tested.
• Any page or link rename:
  • The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • Dashboard default branding data
• Builds on Eclipse Che hosted by Red Hat.
• the Validate language on files added or modified step reports no vale warnings.

[github-actions]

🎊 Navigate the preview: https://65cf8a3a727fea08fd6de8a3--eclipse-che-docs-pr.netlify.app 🎊

[github-actions]

Click here to review and test in web IDE: