Fixed documentation spelling error.
Fixed documentation spelling error.

What should have been 'be' was accidentally typed as 'me'.
keithpitty/haml,haml/haml,nazar-pc/haml,stanhu/haml,macressler/haml,tangposmarvin/haml,nazar-pc/haml,macressler/haml,haml/haml,haml/haml,keithpitty/haml,stanhu/haml,dg1dd1ngs/haml,haml/haml,sideci-sample/sideci-sample-haml,dg1dd1ngs/haml,tangposmarvin/haml