valref.rst: rewrite section on structs with reference semantics
valref.rst: rewrite section on structs with reference semantics

Swift SVN r4423

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