[Bug Fix] Handle generate-at-breakpoints case where only one breakpoint with limit is specified

 When specifying one breakpoint with an explicit limit, it needs to be casted into a list of lists, otherwise the mixin assumes there is a breakpoint called 'max'
We definitely need to be consistent but this choice of comments is correct, the `*/` style are more for headings, I know it sucks without the guidelines, it'll happen soon.