docs(tailwindcss): :memo: Add group variants and new variants

[fenilli]

is using {modifier} the best way to tell it is a variable that the user will create?

[justin-schroeder]

I'm not sure I understand how the group/{modifier} works. Where do you add that exactly?

[fenilli]

As a class to the outerClass, so it syncs with the same modifier variant.

outerClass: group/repeater
labelClass: formkit-invalid/repeater:text-red-500