doc: update link to self-hosted "The Laws of Reflection" article
doc: update link to self-hosted "The Laws of Reflection" article

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/5717046
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go