Fix the fixits for dispatch_async and dispatch_group_async
Fix the fixits for dispatch_async and dispatch_group_async

They erroneously suggested `DispatchQueue.asynchronously`, but it's actually `DispatchQueue.async`.

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