Add additional docs to the concurrent linked list.
Add additional docs to the concurrent linked list.

Swift SVN r23400

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