[Haml] Fix a minor documentation error.
[Haml] Fix a minor documentation error.

nazar-pc/haml,tangposmarvin/sass,xzyfer/sass,DanteKaris/sass,haml/haml,Nzaga/sass,OrenBochman/sass,srinivashappy/sass,danielfein/sass,nicklima/sass,haml/haml,Anshdesire/sass,stanhu/haml,cmpereirasi/sass,amatsuda/haml,purcell/haml,MetaAshley/sass,Galactix/sass,srinivashappy/sass,MetaAshley/sass,sideci-sample/sideci-sample-haml,Industrys/sass,hcatlin/sass,lmetla/sass,dylannnn/sass,antonifs/sass,keithpitty/haml,HugoRLopes/sass,zaru/sass,schneems/sass,OrenBochman/sass,macressler/haml,amitsuroliya/sass,saper/sass,antonifs/sass,stewx/sass,ridixcr/sass,lmetla/sass,saper/sass,haml/haml,HugoRLopes/sass,liquidmetal/sass,dg1dd1ngs/haml,Ahnita/sass,Iamronan/sass,baiyanghese/sass,modulexcite/sass,ridixcr/sass,nickg33/sass,14113/sass,Andrey-Pavlov/sass,Iamronan/sass,xzyfer/sass,tenderlove/sass,stewx/sass,Ahnita/sass,nickg33/sass,jaroot32/sass,Andrey-Pavlov/sass,PMArtz92/sass,liquidmetal/sass,askl56/sass,dylannnn/sass,chriseppstein/sass,rammy7219/sass,Nzaga/sass,dg1dd1ngs/haml,schneems/sass,jaroot32/sass,concord-consortium/haml,srawlins/sass,macressler/haml,chriseppstein/haml,amitsuroliya/sass,JuanitoFatas/sass,keithpitty/haml,Industrys/sass,DanteKaris/sass,hcatlin/sass,rammy7219/sass,srawlins/sass,zaru/sass,tangposmarvin/haml,tangposmarvin/sass,askl56/sass,JuanitoFatas/sass,Anshdesire/sass,haml/haml,stanhu/haml,danielfein/sass,nicklima/sass,uniba/hamldoc_ja,oss-practice/sass,nazar-pc/haml,tangposmarvin/haml,briangonzalez/sass,modulexcite/sass,StephanieMak/sass,StephanieMak/sass,PMArtz92/sass,Galactix/sass,cmpereirasi/sass,chriseppstein/haml