Ensure html_escape docs are picked up by Yard
Ensure html_escape docs are picked up by Yard

Move documentation blocks for html_escape and escape_once next to the
respective method definitions for Ruby 1.9+ so that Yard correctly
includes them.

dg1dd1ngs/haml,stanhu/haml,tangposmarvin/haml,haml/haml,tangposmarvin/haml,haml/haml,nazar-pc/haml,macressler/haml,sideci-sample/sideci-sample-haml,stanhu/haml,haml/haml,dg1dd1ngs/haml,macressler/haml,haml/haml,keithpitty/haml,nazar-pc/haml,keithpitty/haml