[docs] Website improvements (API docs)

[yay]

For example, the following page https://mui.com/x/api/data-grid/data-grid/#props has a horizontal scrollbar for the whole props section.

It's really confusing with a narrow browser window width and looks as if the right sidebar is overlapping the content.
So you make the browser window wider but it remains to be the case.
No matter how wide the browser window is, the horizontal scroll is always there.

Can you please make the UI more responsive and get rid of the horizontal scrolling in cases where there's absolutely no need for it?

[oliviertassinari]

Duplicate of mui/material-ui#34085