update comments for swift_retain, i.e. it returns no reference now
update comments for swift_retain, i.e. it returns no reference now

Swift SVN r32095

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