stdlib: fix comment on ArraySlice.startIndex
stdlib: fix comment on ArraySlice.startIndex

ArraySlice.startIndex is not necessarily zero anymore.

rdar://22633052

Swift SVN r31921

cbrentharris/swift,nathawes/swift,tjw/swift,codestergit/swift,ben-ng/swift,OscarSwanros/swift,slavapestov/swift,alblue/swift,kentya6/swift,swiftix/swift,MukeshKumarS/Swift,lorentey/swift,CodaFi/swift,shajrawi/swift,emilstahl/swift,JaSpa/swift,swiftix/swift.old,russbishop/swift,KrishMunot/swift,tinysun212/swift-windows,ahoppen/swift,devincoughlin/swift,allevato/swift,rudkx/swift,tardieu/swift,harlanhaskins/swift,ken0nek/swift,khizkhiz/swift,sdulal/swift,roambotics/swift,CodaFi/swift,karwa/swift,aschwaighofer/swift,jtbandes/swift,stephentyrone/swift,ahoppen/swift,IngmarStein/swift,parkera/swift,swiftix/swift.old,brentdax/swift,gottesmm/swift,nathawes/swift,apple/swift,hooman/swift,shajrawi/swift,swiftix/swift.old,hooman/swift,arvedviehweger/swift,russbishop/swift,djwbrown/swift,xedin/swift,arvedviehweger/swift,frootloops/swift,milseman/swift,shahmishal/swift,jopamer/swift,glessard/swift,airspeedswift/swift,dduan/swift,shahmishal/swift,felix91gr/swift,hooman/swift,cbrentharris/swift,IngmarStein/swift,kstaring/swift,Ivacker/swift,therealbnut/swift,felix91gr/swift,sdulal/swift,austinzheng/swift,therealbnut/swift,rudkx/swift,allevato/swift,amraboelela/swift,jckarter/swift,kusl/swift,kperryua/swift,shajrawi/swift,dduan/swift,kperryua/swift,bitjammer/swift,tjw/swift,tinysun212/swift-windows,codestergit/swift,huonw/swift,jopamer/swift,amraboelela/swift,return/swift,JaSpa/swift,ken0nek/swift,practicalswift/swift,LeoShimonaka/swift,deyton/swift,return/swift,swiftix/swift,ahoppen/swift,adrfer/swift,gribozavr/swift,milseman/swift,stephentyrone/swift,swiftix/swift.old,swiftix/swift.old,MukeshKumarS/Swift,hughbe/swift,adrfer/swift,Ivacker/swift,tardieu/swift,johnno1962d/swift,zisko/swift,dduan/swift,rudkx/swift,russbishop/swift,Ivacker/swift,sschiau/swift,SwiftAndroid/swift,tinysun212/swift-windows,LeoShimonaka/swift,adrfer/swift,JGiola/swift,SwiftAndroid/swift,practicalswift/swift,milseman/swift,allevato/swift,jopamer/swift,jmgc/swift,practicalswift/swift,alblue/swift,aschwaighofer/swift,atrick/swift,gottesmm/swift,sschiau/swift,huonw/swift,gregomni/swift,gmilos/swift,stephentyrone/swift,xwu/swift,harlanhaskins/swift,gottesmm/swift,natecook1000/swift,bitjammer/swift,jckarter/swift,practicalswift/swift,milseman/swift,gmilos/swift,roambotics/swift,atrick/swift,uasys/swift,swiftix/swift,deyton/swift,xedin/swift,jmgc/swift,kentya6/swift,gregomni/swift,parkera/swift,OscarSwanros/swift,calebd/swift,gmilos/swift,practicalswift/swift,kperryua/swift,therealbnut/swift,slavapestov/swift,russbishop/swift,deyton/swift,IngmarStein/swift,manavgabhawala/swift,xedin/swift,cbrentharris/swift,frootloops/swift,shajrawi/swift,gmilos/swift,milseman/swift,apple/swift,parkera/swift,JGiola/swift,sschiau/swift,amraboelela/swift,uasys/swift,karwa/swift,khizkhiz/swift,mightydeveloper/swift,apple/swift,emilstahl/swift,xwu/swift,kusl/swift,felix91gr/swift,kentya6/swift,MukeshKumarS/Swift,karwa/swift,dreamsxin/swift,return/swift,uasys/swift,CodaFi/swift,milseman/swift,natecook1000/swift,austinzheng/swift,shahmishal/swift,jckarter/swift,bitjammer/swift,djwbrown/swift,zisko/swift,huonw/swift,aschwaighofer/swift,tardieu/swift,adrfer/swift,danielmartin/swift,jtbandes/swift,deyton/swift,tjw/swift,Jnosh/swift,calebd/swift,ken0nek/swift,natecook1000/swift,tkremenek/swift,nathawes/swift,djwbrown/swift,roambotics/swift,kentya6/swift,emilstahl/swift,frootloops/swift,OscarSwanros/swift,KrishMunot/swift,lorentey/swift,bitjammer/swift,ben-ng/swift,emilstahl/swift,allevato/swift,devincoughlin/swift,danielmartin/swift,sdulal/swift,JaSpa/swift,SwiftAndroid/swift,nathawes/swift,LeoShimonaka/swift,slavapestov/swift,jmgc/swift,khizkhiz/swift,tkremenek/swift,manavgabhawala/swift,kentya6/swift,lorentey/swift,kusl/swift,amraboelela/swift,MukeshKumarS/Swift,alblue/swift,shajrawi/swift,johnno1962d/swift,glessard/swift,IngmarStein/swift,devincoughlin/swift,jopamer/swift,djwbrown/swift,amraboelela/swift,ben-ng/swift,sdulal/swift,IngmarStein/swift,karwa/swift,gribozavr/swift,arvedviehweger/swift,stephentyrone/swift,roambotics/swift,modocache/swift,ken0nek/swift,codestergit/swift,atrick/swift,tinysun212/swift-windows,devincoughlin/swift,codestergit/swift,glessard/swift,apple/swift,jopamer/swift,Ivacker/swift,therealbnut/swift,dreamsxin/swift,codestergit/swift,danielmartin/swift,CodaFi/swift,adrfer/swift,deyton/swift,gribozavr/swift,jtbandes/swift,alblue/swift,harlanhaskins/swift,stephentyrone/swift,rudkx/swift,allevato/swift,kperryua/swift,gregomni/swift,sdulal/swift,brentdax/swift,kentya6/swift,benlangmuir/swift,JaSpa/swift,felix91gr/swift,khizkhiz/swift,zisko/swift,SwiftAndroid/swift,stephentyrone/swift,xedin/swift,tardieu/swift,atrick/swift,amraboelela/swift,tkremenek/swift,jmgc/swift,benlangmuir/swift,xedin/swift,slavapestov/swift,therealbnut/swift,airspeedswift/swift,tardieu/swift,danielmartin/swift,tjw/swift,tinysun212/swift-windows,Jnosh/swift,lorentey/swift,sschiau/swift,huonw/swift,khizkhiz/swift,hooman/swift,gottesmm/swift,MukeshKumarS/Swift,LeoShimonaka/swift,CodaFi/swift,alblue/swift,brentdax/swift,emilstahl/swift,benlangmuir/swift,manavgabhawala/swift,khizkhiz/swift,shajrawi/swift,calebd/swift,tjw/swift,manavgabhawala/swift,ken0nek/swift,huonw/swift,felix91gr/swift,modocache/swift,shajrawi/swift,Ivacker/swift,KrishMunot/swift,sdulal/swift,natecook1000/swift,austinzheng/swift,brentdax/swift,therealbnut/swift,gregomni/swift,ken0nek/swift,modocache/swift,bitjammer/swift,amraboelela/swift,xwu/swift,hughbe/swift,adrfer/swift,kusl/swift,kusl/swift,return/swift,airspeedswift/swift,harlanhaskins/swift,johnno1962d/swift,glessard/swift,arvedviehweger/swift,arvedviehweger/swift,hughbe/swift,swiftix/swift,kstaring/swift,austinzheng/swift,codestergit/swift,mightydeveloper/swift,modocache/swift,shahmishal/swift,KrishMunot/swift,cbrentharris/swift,apple/swift,kstaring/swift,slavapestov/swift,apple/swift,mightydeveloper/swift,rudkx/swift,Jnosh/swift,uasys/swift,MukeshKumarS/Swift,OscarSwanros/swift,natecook1000/swift,codestergit/swift,Ivacker/swift,aschwaighofer/swift,JaSpa/swift,mightydeveloper/swift,xwu/swift,ben-ng/swift,modocache/swift,Jnosh/swift,djwbrown/swift,practicalswift/swift,kstaring/swift,mightydeveloper/swift,KrishMunot/swift,zisko/swift,zisko/swift,shahmishal/swift,kperryua/swift,sschiau/swift,djwbrown/swift,nathawes/swift,lorentey/swift,airspeedswift/swift,deyton/swift,airspeedswift/swift,jtbandes/swift,parkera/swift,benlangmuir/swift,uasys/swift,jtbandes/swift,johnno1962d/swift,parkera/swift,cbrentharris/swift,shahmishal/swift,uasys/swift,alblue/swift,MukeshKumarS/Swift,JGiola/swift,lorentey/swift,stephentyrone/swift,xedin/swift,xwu/swift,russbishop/swift,roambotics/swift,sschiau/swift,russbishop/swift,OscarSwanros/swift,ben-ng/swift,frootloops/swift,LeoShimonaka/swift,kperryua/swift,gribozavr/swift,kstaring/swift,gregomni/swift,kentya6/swift,kusl/swift,benlangmuir/swift,tardieu/swift,LeoShimonaka/swift,karwa/swift,gribozavr/swift,devincoughlin/swift,djwbrown/swift,mightydeveloper/swift,hughbe/swift,kusl/swift,parkera/swift,sdulal/swift,OscarSwanros/swift,KrishMunot/swift,lorentey/swift,kentya6/swift,emilstahl/swift,slavapestov/swift,Jnosh/swift,modocache/swift,jopamer/swift,johnno1962d/swift,LeoShimonaka/swift,dduan/swift,ahoppen/swift,austinzheng/swift,danielmartin/swift,kstaring/swift,gmilos/swift,emilstahl/swift,manavgabhawala/swift,LeoShimonaka/swift,gottesmm/swift,hooman/swift,roambotics/swift,nathawes/swift,tkremenek/swift,zisko/swift,khizkhiz/swift,aschwaighofer/swift,atrick/swift,alblue/swift,brentdax/swift,uasys/swift,glessard/swift,SwiftAndroid/swift,swiftix/swift,cbrentharris/swift,sdulal/swift,natecook1000/swift,tkremenek/swift,nathawes/swift,natecook1000/swift,swiftix/swift,emilstahl/swift,hooman/swift,karwa/swift,gmilos/swift,IngmarStein/swift,austinzheng/swift,modocache/swift,IngmarStein/swift,hooman/swift,xwu/swift,JGiola/swift,brentdax/swift,dduan/swift,SwiftAndroid/swift,gregomni/swift,devincoughlin/swift,tardieu/swift,adrfer/swift,xwu/swift,jmgc/swift,gribozavr/swift,felix91gr/swift,allevato/swift,tinysun212/swift-windows,manavgabhawala/swift,russbishop/swift,return/swift,sschiau/swift,xedin/swift,dduan/swift,calebd/swift,huonw/swift,harlanhaskins/swift,danielmartin/swift,Ivacker/swift,jckarter/swift,therealbnut/swift,bitjammer/swift,kperryua/swift,bitjammer/swift,manavgabhawala/swift,JGiola/swift,tjw/swift,arvedviehweger/swift,Jnosh/swift,airspeedswift/swift,calebd/swift,jmgc/swift,allevato/swift,CodaFi/swift,felix91gr/swift,kusl/swift,ben-ng/swift,swiftix/swift.old,return/swift,JaSpa/swift,lorentey/swift,danielmartin/swift,aschwaighofer/swift,hughbe/swift,frootloops/swift,milseman/swift,benlangmuir/swift,huonw/swift,deyton/swift,austinzheng/swift,xedin/swift,gmilos/swift,ben-ng/swift,JGiola/swift,cbrentharris/swift,tkremenek/swift,gribozavr/swift,tinysun212/swift-windows,brentdax/swift,harlanhaskins/swift,johnno1962d/swift,jmgc/swift,mightydeveloper/swift,KrishMunot/swift,airspeedswift/swift,devincoughlin/swift,hughbe/swift,jopamer/swift,karwa/swift,karwa/swift,jckarter/swift,ahoppen/swift,frootloops/swift,frootloops/swift,ken0nek/swift,tkremenek/swift,cbrentharris/swift,gottesmm/swift,shahmishal/swift,jtbandes/swift,swiftix/swift.old,CodaFi/swift,harlanhaskins/swift,gribozavr/swift,devincoughlin/swift,jckarter/swift,jckarter/swift,ahoppen/swift,atrick/swift,glessard/swift,JaSpa/swift,tjw/swift,parkera/swift,hughbe/swift,kstaring/swift,Ivacker/swift,gottesmm/swift,sschiau/swift,practicalswift/swift,parkera/swift,calebd/swift,jtbandes/swift,mightydeveloper/swift,shahmishal/swift,Jnosh/swift,practicalswift/swift,aschwaighofer/swift,slavapestov/swift,calebd/swift,dduan/swift,OscarSwanros/swift,SwiftAndroid/swift,arvedviehweger/swift,zisko/swift,rudkx/swift,swiftix/swift,swiftix/swift.old,return/swift,johnno1962d/swift,shajrawi/swift