Changes to ghc

Changes to ghc:
commit fe0cbe48f2ec8f2ed8d1029c593220ae85324083
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Fri Jun 27 11:40:08 2014 +0100

    Fix docs typo.

    Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>