update content-for docs
update content-for docs

lvonk/sinatra-contrib,zBMNForks/sinatra-contrib,TimurTarasenko/sinatra-contrib,gferguson-gd/sinatra-contrib,mwpastore/sinatra-contrib,sferik/sinatra-contrib,r7kamura/sinatra-contrib,lvonk/sinatra-contrib,chicisimo/sinatra-contrib,r7kamura/sinatra-contrib,chicisimo/sinatra-contrib,rkh/sinatra-contrib,sferik/sinatra-contrib,zBMNForks/sinatra-contrib,D1plo1d/sinatra-contrib,mwpastore/sinatra-contrib,joelmoss/sinatra-contrib,TimurTarasenko/sinatra-contrib,joelmoss/sinatra-contrib,gferguson-gd/sinatra-contrib