[release-branch.go1.3] doc: remove the "the" in "the the" in the release notes

««« CL 128170043 / f824bdf8e6ba
doc: remove the "the" in "the the" in the release notes

LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/128170043
»»»

TBR=r
CC=golang-codereviews
https://codereview.appspot.com/128290043
[release-branch.go1.3] doc: make it point to correct go1.3.1 change history

««« CL 129180043 / cf5017c4a780
doc: make it point to correct go1.3.1 change history

LGTM=minux, adg
R=golang-codereviews, minux, adg
CC=golang-codereviews
https://codereview.appspot.com/129180043
»»»

TBR=r
CC=golang-codereviews
https://codereview.appspot.com/122670043