Update test command documentation

[stephanecopin]

Updates the documentation accounting for the changes in tuist/tuist#5135.

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[danieleformichelli]

@pepicrft this is why I don't like having docs and tuist on separate repos.
The PR on tuist and this one should be an atomic change.

Is there any reason to prefer having this as a separate repo?

[pepicrft]

Is there any reason to prefer having this as a separate repo?

Yes, first and most importantly, I'm working on a new documentation that builds upon Swift Catalogs and lives in the tuist/tuist repository and the experience is tightly integrated into Xcode. So this is only a temporary move until I have all the documentation ready.

Apart from that, the amount of complexity we've inherited in the repository outweighs the value we get out of being able to ship atomic PRs. Although it's hard to see it once you are familiar with the repository structure, for people coming across the repository for the first time is somewhat overwhelming. I captured part of it in this issue.

[pepicrft]

@all-contributors add @stephanecopin for documentation

[allcontributors]

@pepicrft

I've put up a pull request to add @stephanecopin! 🎉