Fix up comment specification of decl-sil to make it clear that a decl-sil-body is optional.
Fix up comment specification of decl-sil to make it clear that a decl-sil-body is optional.

Swift SVN r32103

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