Fix chapel quick reference

Two changes:

* Page 1 Column 3, the table "Formal Argument Intents", blank intent, the "like 'ref'" part - removed "domains", added "atomics"

* Page 2 top of Column 3 - Zipper Iteration - added a right paren before 'do'.

I verified the .pdf by opening it in Adobe Reader on my linux desktop and printing it on a printer.