Document options for --trace and --backtrace.
Document options for --trace and --backtrace.

tmornini/rake,hsbt/rake,hsbt/rake,envato/rake,Vanzct/rake,ruby/rake,bentley/rake,askl56/rake,88rabbit/rake,taiganakagawa/rake,pjump/rake,zzak/rake,esasse/rake,ipmobiletech/rake,codedogfish/rake,utilum/rake,envato/rake,jaustinhughey/rake,ruby/rake