[css3-fonts] font-stretch ordering (editorial)

<http://dev.w3.org/csswg/css3-fonts/#font-stretch-prop>:

"Absolute keyword values have the following ordering, from narrowest to
widest:" continues with a list of plain english descriptions of the
values to be ordered. 

I'd expect the list to actually list the property values, i.e. instead
of "Ultra Condensed", it should be "ultra-condensed" for clarity and accuracy.

-chris