Er, not sure if you're looking at the before and after screenshots the wrong way round? The new design appears to reduce the number of characters per line from ~100 to ~80 (by increasing the body font size).
Compare first line of Array#slice in the old design:
"The slice() method returns a shallow copy of a portion of an array into a new array object selected"
vs the new:
"The slice() method returns a shallow copy of a portion of an array into a new array"