StdlibUnittest: add a doc comment to LifetimeTracked, and remove a fixme
StdlibUnittest: add a doc comment to LifetimeTracked, and remove a fixme

ahoppen/swift,CodaFi/swift,huonw/swift,alblue/swift,CodaFi/swift,frootloops/swift,tjw/swift,jtbandes/swift,airspeedswift/swift,ahoppen/swift,manavgabhawala/swift,amraboelela/swift,hooman/swift,karwa/swift,milseman/swift,allevato/swift,ben-ng/swift,return/swift,deyton/swift,IngmarStein/swift,ahoppen/swift,karwa/swift,nathawes/swift,calebd/swift,jopamer/swift,IngmarStein/swift,modocache/swift,danielmartin/swift,apple/swift,stephentyrone/swift,xedin/swift,kperryua/swift,parkera/swift,sschiau/swift,russbishop/swift,jmgc/swift,parkera/swift,austinzheng/swift,OscarSwanros/swift,lorentey/swift,harlanhaskins/swift,aschwaighofer/swift,tardieu/swift,codestergit/swift,Jnosh/swift,atrick/swift,ken0nek/swift,nathawes/swift,natecook1000/swift,stephentyrone/swift,natecook1000/swift,nathawes/swift,manavgabhawala/swift,OscarSwanros/swift,shajrawi/swift,russbishop/swift,zisko/swift,kperryua/swift,aschwaighofer/swift,felix91gr/swift,swiftix/swift,frootloops/swift,jmgc/swift,milseman/swift,tjw/swift,amraboelela/swift,huonw/swift,atrick/swift,nathawes/swift,arvedviehweger/swift,huonw/swift,practicalswift/swift,uasys/swift,modocache/swift,devincoughlin/swift,nathawes/swift,swiftix/swift,ken0nek/swift,amraboelela/swift,aschwaighofer/swift,ben-ng/swift,harlanhaskins/swift,jmgc/swift,kstaring/swift,practicalswift/swift,kstaring/swift,sschiau/swift,jtbandes/swift,milseman/swift,ben-ng/swift,tardieu/swift,sschiau/swift,rudkx/swift,rudkx/swift,arvedviehweger/swift,codestergit/swift,atrick/swift,glessard/swift,amraboelela/swift,modocache/swift,djwbrown/swift,tkremenek/swift,manavgabhawala/swift,tkremenek/swift,gmilos/swift,jmgc/swift,apple/swift,jmgc/swift,austinzheng/swift,swiftix/swift,shajrawi/swift,zisko/swift,kstaring/swift,alblue/swift,tjw/swift,brentdax/swift,benlangmuir/swift,calebd/swift,Jnosh/swift,practicalswift/swift,gribozavr/swift,arvedviehweger/swift,xedin/swift,tinysun212/swift-windows,hooman/swift,shahmishal/swift,austinzheng/swift,milseman/swift,xwu/swift,devincoughlin/swift,huonw/swift,glessard/swift,OscarSwanros/swift,ken0nek/swift,IngmarStein/swift,airspeedswift/swift,CodaFi/swift,tinysun212/swift-windows,jckarter/swift,airspeedswift/swift,IngmarStein/swift,glessard/swift,JGiola/swift,brentdax/swift,frootloops/swift,xwu/swift,gregomni/swift,gribozavr/swift,shahmishal/swift,gottesmm/swift,uasys/swift,gmilos/swift,gottesmm/swift,codestergit/swift,russbishop/swift,harlanhaskins/swift,jopamer/swift,harlanhaskins/swift,jckarter/swift,aschwaighofer/swift,hooman/swift,bitjammer/swift,kperryua/swift,gribozavr/swift,gribozavr/swift,jopamer/swift,OscarSwanros/swift,xwu/swift,parkera/swift,karwa/swift,djwbrown/swift,alblue/swift,uasys/swift,hughbe/swift,shajrawi/swift,benlangmuir/swift,jmgc/swift,jtbandes/swift,rudkx/swift,codestergit/swift,arvedviehweger/swift,tjw/swift,apple/swift,tardieu/swift,tardieu/swift,arvedviehweger/swift,manavgabhawala/swift,felix91gr/swift,hughbe/swift,airspeedswift/swift,uasys/swift,kstaring/swift,nathawes/swift,jtbandes/swift,natecook1000/swift,xwu/swift,deyton/swift,lorentey/swift,aschwaighofer/swift,roambotics/swift,amraboelela/swift,brentdax/swift,dreamsxin/swift,shahmishal/swift,xwu/swift,gregomni/swift,karwa/swift,djwbrown/swift,atrick/swift,parkera/swift,practicalswift/swift,airspeedswift/swift,devincoughlin/swift,tinysun212/swift-windows,deyton/swift,uasys/swift,apple/swift,danielmartin/swift,deyton/swift,rudkx/swift,alblue/swift,deyton/swift,hughbe/swift,ben-ng/swift,karwa/swift,ken0nek/swift,devincoughlin/swift,benlangmuir/swift,ahoppen/swift,xedin/swift,milseman/swift,alblue/swift,swiftix/swift,natecook1000/swift,huonw/swift,JaSpa/swift,tjw/swift,ken0nek/swift,shahmishal/swift,amraboelela/swift,codestergit/swift,gottesmm/swift,airspeedswift/swift,tinysun212/swift-windows,shajrawi/swift,codestergit/swift,gmilos/swift,hughbe/swift,gregomni/swift,austinzheng/swift,xedin/swift,lorentey/swift,hughbe/swift,nathawes/swift,atrick/swift,xedin/swift,jopamer/swift,jckarter/swift,sschiau/swift,manavgabhawala/swift,JaSpa/swift,return/swift,apple/swift,jckarter/swift,bitjammer/swift,milseman/swift,IngmarStein/swift,benlangmuir/swift,huonw/swift,JGiola/swift,return/swift,russbishop/swift,shahmishal/swift,xedin/swift,jopamer/swift,karwa/swift,ben-ng/swift,CodaFi/swift,rudkx/swift,roambotics/swift,kstaring/swift,hooman/swift,lorentey/swift,therealbnut/swift,danielmartin/swift,natecook1000/swift,alblue/swift,devincoughlin/swift,tardieu/swift,kperryua/swift,aschwaighofer/swift,modocache/swift,sschiau/swift,austinzheng/swift,ken0nek/swift,deyton/swift,bitjammer/swift,manavgabhawala/swift,sschiau/swift,russbishop/swift,sschiau/swift,djwbrown/swift,brentdax/swift,hooman/swift,brentdax/swift,milseman/swift,karwa/swift,calebd/swift,xedin/swift,Jnosh/swift,jopamer/swift,modocache/swift,hughbe/swift,return/swift,therealbnut/swift,felix91gr/swift,shahmishal/swift,therealbnut/swift,practicalswift/swift,amraboelela/swift,shahmishal/swift,IngmarStein/swift,tardieu/swift,lorentey/swift,karwa/swift,shajrawi/swift,Osca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