go spec: minor fix, to match conversion rules 4 and 5
go spec: minor fix, to match conversion rules 4 and 5

R=rsc
CC=golang-dev
http://codereview.appspot.com/1270042

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

pombredanne/go-deleteme,tianon/debian-golang,tv42/old-go,ssrl/go,apparentlymart/golang,tianon/debian-golang,nightlyone/golang,apparentlymart/golang,gnanderson/go,gnanderson/go,bdwalton/debian-golang,tianon/debian-golang,h8liu/golang,ssrl/go,ssrl/go,h8liu/golang,ssrl/go,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,bdwalton/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,nightlyone/golang,pombredanne/go-deleteme,h8liu/golang,gnanderson/go,bdwalton/debian-golang,apparentlymart/golang,tianon/debian-golang,nightlyone/golang,h8liu/golang,bdwalton/debian-golang,nightlyone/golang,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,ssrl/go,h8liu/golang,dsriram/golang,h8liu/golang,dsriram/golang,tv42/old-go,gnanderson/go,ssrl/go,gnanderson/go,bdwalton/debian-golang,dsriram/golang,nightlyone/golang,apparentlymart/golang,h8liu/golang,tianon/debian-golang,ssrl/go,tv42/old-go,tianon/debian-golang,dsriram/golang,tianon/debian-golang,dsriram/golang,nightlyone/golang,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,bdwalton/debian-golang,gnanderson/go,apparentlymart/golang,tv42/old-go,tianon/debian-golang,nightlyone/golang