Add a comment to UnsafePointer assignment. (#4070)
Add a comment to UnsafePointer assignment. (#4070)

Initializing trivial types via assignment is allowed by convention,
so make it official.
gmilos/swift,apple/swift,manavgabhawala/swift,amraboelela/swift,hughbe/swift,kperryua/swift,jmgc/swift,deyton/swift,swiftix/swift,djwbrown/swift,modocache/swift,aschwaighofer/swift,tjw/swift,atrick/swift,benlangmuir/swift,tinysun212/swift-windows,calebd/swift,uasys/swift,danielmartin/swift,deyton/swift,practicalswift/swift,kperryua/swift,swiftix/swift,austinzheng/swift,JaSpa/swift,harlanhaskins/swift,tardieu/swift,nathawes/swift,CodaFi/swift,jtbandes/swift,sschiau/swift,calebd/swift,djwbrown/swift,jopamer/swift,zisko/swift,Jnosh/swift,tardieu/swift,gmilos/swift,danielmartin/swift,nathawes/swift,rudkx/swift,return/swift,stephentyrone/swift,deyton/swift,Jnosh/swift,return/swift,danielmartin/swift,apple/swift,austinzheng/swift,therealbnut/swift,jtbandes/swift,codestergit/swift,karwa/swift,tjw/swift,danielmartin/swift,glessard/swift,brentdax/swift,gottesmm/swift,swiftix/swift,JGiola/swift,lorentey/swift,xedin/swift,rudkx/swift,aschwaighofer/swift,shajrawi/swift,uasys/swift,amraboelela/swift,sschiau/swift,airspeedswift/swift,alblue/swift,atrick/swift,shajrawi/swift,hooman/swift,felix91gr/swift,huonw/swift,JaSpa/swift,atrick/swift,gregomni/swift,arvedviehweger/swift,kperryua/swift,ben-ng/swift,zisko/swift,shahmishal/swift,bitjammer/swift,arvedviehweger/swift,tkremenek/swift,kperryua/swift,harlanhaskins/swift,tkremenek/swift,parkera/swift,swiftix/swift,bitjammer/swift,alblue/swift,lorentey/swift,milseman/swift,stephentyrone/swift,kstaring/swift,kstaring/swift,shajrawi/swift,uasys/swift,return/swift,jtbandes/swift,amraboelela/swift,karwa/swift,felix91gr/swift,nathawes/swift,apple/swift,calebd/swift,jopamer/swift,frootloops/swift,harlanhaskins/swift,tjw/swift,kstaring/swift,jckarter/swift,devincoughlin/swift,tjw/swift,lorentey/swift,arvedviehweger/swift,therealbnut/swift,huonw/swift,devincoughlin/swift,codestergit/swift,austinzheng/swift,tkremenek/swift,codestergit/swift,hooman/swift,austinzheng/swift,apple/swift,CodaFi/swift,allevato/swift,tinysun212/swift-windows,OscarSwanros/swift,tinysun212/swift-windows,xedin/swift,lorentey/swift,kstaring/swift,practicalswift/swift,stephentyrone/swift,hughbe/swift,harlanhaskins/swift,amraboelela/swift,frootloops/swift,jmgc/swift,brentdax/swift,djwbrown/swift,felix91gr/swift,hooman/swift,ben-ng/swift,gmilos/swift,alblue/swift,gribozavr/swift,gregomni/swift,CodaFi/swift,hooman/swift,tardieu/swift,manavgabhawala/swift,shahmishal/swift,apple/swift,ben-ng/swift,natecook1000/swift,brentdax/swift,xedin/swift,nathawes/swift,harlanhaskins/swift,airspeedswift/swift,shajrawi/swift,airspeedswift/swift,arvedviehweger/swift,jtbandes/swift,benlangmuir/swift,JaSpa/swift,JGiola/swift,IngmarStein/swift,benlangmuir/swift,manavgabhawala/swift,sschiau/swift,tinysun212/swift-windows,codestergit/swift,zisko/swift,hooman/swift,alblue/swift,natecook1000/swift,jmgc/swift,glessard/swift,manavgabhawala/swift,shahmishal/swift,djwbrown/swift,JaSpa/swift,modocache/swift,hughbe/swift,IngmarStein/swift,CodaFi/swift,shahmishal/swift,stephentyrone/swift,return/swift,xwu/swift,jckarter/swift,lorentey/swift,deyton/swift,amraboelela/swift,manavgabhawala/swift,jopamer/swift,tardieu/swift,ben-ng/swift,parkera/swift,huonw/swift,modocache/swift,codestergit/swift,xwu/swift,harlanhaskins/swift,shahmishal/swift,gregomni/swift,natecook1000/swift,shajrawi/swift,milseman/swift,practicalswift/swift,felix91gr/swift,tjw/swift,jckarter/swift,return/swift,austinzheng/swift,codestergit/swift,alblue/swift,zisko/swift,gmilos/swift,natecook1000/swift,milseman/swift,alblue/swift,CodaFi/swift,tkremenek/swift,allevato/swift,parkera/swift,gribozavr/swift,therealbnut/swift,brentdax/swift,jmgc/swift,codestergit/swift,shahmishal/swift,gottesmm/swift,karwa/swift,felix91gr/swift,xedin/swift,gribozavr/swift,allevato/swift,stephentyrone/swift,devincoughlin/swift,ben-ng/swift,IngmarStein/swift,brentdax/swift,arvedviehweger/swift,milseman/swift,djwbrown/swift,benlangmuir/swift,austinzheng/swift,OscarSwanros/swift,glessard/swift,kstaring/swift,Jnosh/swift,jopamer/swift,frootloops/swift,alblue/swift,Jnosh/swift,xwu/swift,manavgabhawala/swift,brentdax/swift,xwu/swift,jmgc/swift,milseman/swift,jmgc/swift,JaSpa/swift,aschwaighofer/swift,xwu/swift,kperryua/swift,CodaFi/swift,lorentey/swift,tjw/swift,shahmishal/swift,tinysun212/swift-windows,jopamer/swift,atrick/swift,tardieu/swift,xedin/swift,allevato/swift,amraboelela/swift,airspeedswift/swift,devincoughlin/swift,benlangmuir/swift,tinysun212/swift-windows,glessard/swift,swiftix/swift,bitjammer/swift,practicalswift/swift,sschiau/swift,IngmarStein/swift,stephentyrone/swift,xedin/swift,glessard/swift,hooman/swift,gottesmm/swift,roambotics/swift,hughbe/swift,swiftix/swift,ahoppen/swift,zisko/swift,ahoppen/swift,parkera/swift,calebd/swift,shahmishal/swift,sschiau/swift,deyton/swift,gribozavr/swift,sschiau/swift,calebd/swift,bitjammer/swift,felix91gr/swift,bitjammer/swift,calebd/swift,IngmarStein/swift,rudkx/swift,modocache/swift,danielmartin/swift,brentdax/swift,roambotics/swift,roambotics/swift,natecook10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