fixups for memory model document
fixups for memory model document

R=rsc
CC=go-dev
http://go/go-review/1016018

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