*** Submitted as
http://code.google.com/p/go/source/detail?r=9b2c48c9d597 ***
exp/html: update package docs and add an example; a node's children is
a linked list, not a slice.
R=r, minux.ma
CC=golang-dev
http://codereview.appspot.com/6618055
http://codereview.appspot.com/6618055/
