Fixed commentary in +ff (#781)
Fixed commentary in +ff (#781)

A comment incorrectly indicated that `w` was a face for two different terms in the same arm.
jfranklin9000/urbit,urbit/urbit,belisarius222/arvo,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,belisarius222/arvo,urbit/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,joemfb/arvo,ngzax/urbit,joemfb/arvo,jfranklin9000/urbit