Update deprecation warning for MS RDS

[craddm]

✅ Checklist

• You have given your pull request a meaningful title (e.g. Enable foobar integration rather than 515 foobar).
• You are targeting the appropriate branch. If you're not certain which one this is, it should be develop.
• Your branch is up-to-date with the target branch (it probably was when you started, but it may have changed since then).
• You have marked this pull request as a draft and added '[WIP]' to the title if needed (if you're not yet ready to merge).
• You have formatted your code using appropriate automated tools (for example ./tests/AutoFormat_Powershell.ps1 -TargetPath <path to file or directory> for Powershell).

⤴️ Summary

Since release-4.0.4 will now be release-4.1.0, the deprecation warning for Microsoft Remote Desktop needs to be updated in the docs.

This commit should also be cherry-picked into the release branch.

🌂 Related issues

🔬 Tests

Documentation only

[jemrobinson]

LGTM