doc/effective_go.html: fix syntax error in code example Fixes issue 5333.
doc/effective_go.html: fix syntax error in code example
Fixes issue 5333.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/8698046

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