doc: fix go_spec spelling errors
doc: fix go_spec spelling errors

R=gri
CC=golang-dev
http://codereview.appspot.com/2970042

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

gnanderson/go,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,tv42/old-go,tv42/old-go,ssrl/go,ssrl/go,pombredanne/go-deleteme,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,h8liu/golang,dsriram/golang,dsriram/golang,gnanderson/go,h8liu/golang,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,h8liu/golang,gnanderson/go,pombredanne/go-deleteme,h8liu/golang,ssrl/go,gnanderson/go,apparentlymart/golang,ssrl/go,h8liu/golang,tv42/old-go,ssrl/go,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,apparentlymart/golang,ssrl/go,ssrl/go,h8liu/golang,dsriram/golang,gnanderson/go,gnanderson/go,dsriram/golang,apparentlymart/golang,h8liu/golang,dsriram/golang