fix: Update article to configure a user namespace

[tolusha]

What does this pull request change?

fix: Update article to configure a user namespace

What issues does this pull request fix or reference?

https://github.com/eclipse-che/che/issues/23176

Specify the version of the product this pull request applies to

main

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.

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[ibuziuk]

@deerskindoll do you happen to know why the preview URL is not working? https://github.com/eclipse-che/che-docs/pull/2807#issuecomment-2437230317

[deerskindoll]

@deerskindoll do you happen to know why the preview URL is not working? #2807 (comment)

@ibuziuk I suspect it's because of the failed pipelines. @mkuznyetsov what do you think? can you please have a look? the asciidoctor issue was reported to the Vale support group but it didn't affect the other pipelines previously.

[deerskindoll]

update: running preview from a che workspace works. no idea why the preview isn't generated in the PR itself.