[release-branch.go1.4] cmd/go: regenerate doc.go

««« CL 183000043 / 871468f5ceaf
cmd/go: regenerate doc.go

Move change from CL 170770043 to correct file and regenerate docs
for changes from CL 164120043.

LGTM=adg
R=golang-codereviews, adg, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/183000043

Committer: Andrew Gerrand <adg@golang.org>
»»»

LGTM=minux
R=bradfitz, minux
CC=golang-codereviews
https://codereview.appspot.com/181490043