about border-radius

>http://cssreference.io/property/border-radius/

The `description` of two value may be a mistake.
From [MDN[(https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius) about this two value, 
the first is top-left/bottom-right and the second is top-right/bottom-left;

And could it be possible if add more border-radius example like `4 value`(clockwise); `slash value`.etc