Fixes example snippets in MutableCollection.swift
Fixes example snippets in MutableCollection.swift

ahoppen/swift,tkremenek/swift,stephentyrone/swift,airspeedswift/swift,JGiola/swift,ahoppen/swift,jckarter/swift,airspeedswift/swift,atrick/swift,xwu/swift,tkremenek/swift,jmgc/swift,airspeedswift/swift,atrick/swift,gregomni/swift,xwu/swift,glessard/swift,CodaFi/swift,xwu/swift,aschwaighofer/swift,apple/swift,nathawes/swift,airspeedswift/swift,benlangmuir/swift,apple/swift,atrick/swift,stephentyrone/swift,roambotics/swift,jckarter/swift,parkera/swift,jckarter/swift,stephentyrone/swift,ahoppen/swift,roambotics/swift,hooman/swift,glessard/swift,ahoppen/swift,nathawes/swift,hooman/swift,JGiola/swift,atrick/swift,apple/swift,JGiola/swift,rudkx/swift,roambotics/swift,hooman/swift,rudkx/swift,roambotics/swift,JGiola/swift,jmgc/swift,JGiola/swift,nathawes/swift,tkremenek/swift,tkremenek/swift,glessard/swift,harlanhaskins/swift,jmgc/swift,glessard/swift,glessard/swift,stephentyrone/swift,allevato/swift,ahoppen/swift,atrick/swift,harlanhaskins/swift,tkremenek/swift,CodaFi/swift,gregomni/swift,nathawes/swift,CodaFi/swift,benlangmuir/swift,tkremenek/swift,harlanhaskins/swift,allevato/swift,jmgc/swift,harlanhaskins/swift,nathawes/swift,CodaFi/swift,parkera/swift,nathawes/swift,aschwaighofer/swift,aschwaighofer/swift,stephentyrone/swift,CodaFi/swift,hooman/swift,gregomni/swift,atrick/swift,apple/swift,rudkx/swift,ahoppen/swift,tkremenek/swift,parkera/swift,allevato/swift,gregomni/swift,allevato/swift,aschwaighofer/swift,parkera/swift,gregomni/swift,parkera/swift,jckarter/swift,jmgc/swift,hooman/swift,benlangmuir/swift,xwu/swift,rudkx/swift,stephentyrone/swift,xwu/swift,apple/swift,harlanhaskins/swift,allevato/swift,JGiola/swift,nathawes/swift,allevato/swift,roambotics/swift,CodaFi/swift,harlanhaskins/swift,hooman/swift,allevato/swift,roambotics/swift,airspeedswift/swift,jckarter/swift,stephentyrone/swift,jmgc/swift,xwu/swift,aschwaighofer/swift,jmgc/swift,apple/swift,benlangmuir/swift,aschwaighofer/swift,glessard/swift,parkera/swift,parkera/swift,xwu/swift,jckarter/swift,benlangmuir/swift,CodaFi/swift,parkera/swift,aschwaighofer/swift,hooman/swift,harlanhaskins/swift,rudkx/swift,benlangmuir/swift,gregomni/swift,airspeedswift/swift,rudkx/swift,airspeedswift/swift,jckarter/swift