doc/articles/json_and_go: fix some format.
doc/articles/json_and_go: fix some format.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/7131045

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go