doc/code.html: fix reference to "gomake build"
doc/code.html: fix reference to "gomake build"

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/3288042

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

h8liu/golang,ssrl/go,apparentlymart/golang,gnanderson/go,tv42/old-go,ssrl/go,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,ssrl/go,tv42/old-go,gnanderson/go,tv42/old-go,apparentlymart/golang,ssrl/go,gnanderson/go,ssrl/go,h8liu/golang,gnanderson/go,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,h8liu/golang,ssrl/go,h8liu/golang,ssrl/go,h8liu/golang,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,tv42/old-go,apparentlymart/golang,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,h8liu/golang,h8liu/golang,gnanderson/go,gnanderson/go,apparentlymart/golang,dsriram/golang,apparentlymart/golang,pombredanne/go-deleteme