Rewrite docs for span and drop
Rewrite docs for span and drop

ikesyo/Swiftz,CodaFi/swiftz,ryanbooker/Swiftz,mpurland/Swiftz,typelift/swiftz,CodaFi/swiftz,ikesyo/Swiftz,mpurland/Swiftz,tranhieutt/Swiftz,ikesyo/Swiftz,CodaFi/swiftz,typelift/swiftz,mpurland/Swiftz,tranhieutt/Swiftz,ryanbooker/Swiftz,typelift/swiftz