liblink: fix comments.  Someone was overzealous with search & replace.
liblink: fix comments.  Someone was overzealous with search & replace.

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/49160045

apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang