docs: Fix admonition rendering

[huguestennier]

Fix https://github.com/heartexlabs/label-studio/issues/4538

How to QA

These should all work now:

https://deploy-preview-4541--label-studio-docs-new-theme.netlify.app/guide/install.html#Install-with-Docker-on-nix https://deploy-preview-4541--label-studio-docs-new-theme.netlify.app/guide/signup.html#Create-an-account

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[ReDeiPirati]

Hey @huguestennier!

I also spotted this other line. After that looks good to me.

Thanks!

[hogepodge]

LGTM

[github-actions[bot]]

This PR is stale because it has been open 172 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[robot-ci-heartex]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[sajarin]

@huguestennier can we resolve the conflicts here?

[robot-ci-heartex]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[robot-ci-heartex]

This PR was closed because it has been stalled for 10 days with no activity.