[Haml] Convert Haml::Helpers docs to YARD.
[Haml] Convert Haml::Helpers docs to YARD.

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