Fixes#1742.
I hope.
Also this picks up an update to go_tutorial.html that should already have happened.
R=brainman, rsc, peterGo
CC=golang-dev
https://golang.org/cl/4452050
*** Reason for rollback ***
roll back the changes to the tutorial programs (only) since they
break the automated processing used to create the tutorial.
*** Original change description ***
apply gofmt to the LGTM-marked files from 34501
that have not changed since I applied gofmt.
R=rsc
DELTA=139 (0 added, 44 deleted, 95 changed)
OCL=35670
CL=35670
will bring document in line in a later CL, which may include revisiting some of the names
R=rsc
DELTA=58 (0 added, 0 deleted, 58 changed)
OCL=22906
CL=22908
