tutorial: update go_tutorial.txt should have been included in last CL; no idea why it was not
tutorial: update go_tutorial.txt
should have been included in last CL; no idea why it was not

R=brainman
CC=golang-dev
http://codereview.appspot.com/4005043

tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,ssrl/go,dsriram/golang,tv42/old-go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,dsriram/golang,ssrl/go,pombredanne/go-deleteme,ssrl/go,apparentlymart/golang,tv42/old-go,tv42/old-go,dsriram/golang,ssrl/go,apparentlymart/golang,gnanderson/go,dsriram/golang,dsriram/golang,ssrl/go,pombredanne/go-deleteme,ssrl/go,tv42/old-go,gnanderson/go,ssrl/go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,dsriram/golang,dsriram/golang,gnanderson/go,apparentlymart/golang