Update the whitepaper digraphs to match tutorial.
Update the whitepaper digraphs to match tutorial.

The ones on this tutorial seem to be newer: http://urbit.org/docs/dev/hoon/principles/2-syntax
jfranklin9000/urbit,cgyarvin/arvo,joemfb/arvo,ngzax/urbit,jfranklin9000/urbit,joemfb/arvo,belisarius222/arvo,ngzax/urbit,ohAitch/arvo,ohAitch/arvo,jfranklin9000/urbit,Fang-/arvo,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,solri/arvo,ngzax/urbit,urbit/urbit,belisarius222/arvo,ngzax/urbit,ngzax/urbit,urbit/urbit,cgyarvin/arvo,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,eglaysher/arvo,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit