bug(docs): code formatting is broken when there are multiple tabs

Hey, I was going through your docs and realized formatting of some of your samples are broken. It seem to be whenever there are multiple tabs, the first tab is like the attached image. I'm on Firefox + NixOS.

https://rivet.dev/actors/docs/crash-course/

<img width="1601" height="1050" alt="Image" src="https://github.com/user-attachments/assets/dbc4118d-ff9a-42d3-8775-6caae178d4de" />

