[IntelliSense] [V4-beta.9] Add pixel comments to container etc.

[stijns96]

Breakpoints and container queries are obviously not the same. Without pixels in the comments it can be super confusing. Breakpoints already have it, but container queries not yet.

@xxx-md: -> 28rem /* 448px */
md: -> @media (width >= 48rem /* 768px */)

I was actually expecting that they would be the same, but probably do need more query variations then breakpoints