[docs] Mention update-checkout in Branches.md. (#11169)
[docs] Mention update-checkout in Branches.md. (#11169)


alblue/swift,uasys/swift,devincoughlin/swift,JGiola/swift,stephentyrone/swift,practicalswift/swift,huonw/swift,brentdax/swift,gregomni/swift,parkera/swift,airspeedswift/swift,danielmartin/swift,amraboelela/swift,danielmartin/swift,roambotics/swift,austinzheng/swift,CodaFi/swift,roambotics/swift,brentdax/swift,parkera/swift,return/swift,natecook1000/swift,uasys/swift,xedin/swift,amraboelela/swift,austinzheng/swift,deyton/swift,practicalswift/swift,milseman/swift,tjw/swift,airspeedswift/swift,shahmishal/swift,amraboelela/swift,shahmishal/swift,milseman/swift,hooman/swift,harlanhaskins/swift,aschwaighofer/swift,gribozavr/swift,CodaFi/swift,return/swift,ahoppen/swift,lorentey/swift,sschiau/swift,karwa/swift,gribozavr/swift,alblue/swift,xwu/swift,nathawes/swift,tkremenek/swift,gregomni/swift,austinzheng/swift,natecook1000/swift,apple/swift,stephentyrone/swift,shahmishal/swift,xwu/swift,natecook1000/swift,gribozavr/swift,airspeedswift/swift,allevato/swift,tkremenek/swift,JGiola/swift,xwu/swift,gregomni/swift,gribozavr/swift,austinzheng/swift,OscarSwanros/swift,JGiola/swift,OscarSwanros/swift,JGiola/swift,nathawes/swift,apple/swift,allevato/swift,uasys/swift,xwu/swift,tkremenek/swift,jopamer/swift,frootloops/swift,return/swift,tjw/swift,devincoughlin/swift,hooman/swift,alblue/swift,stephentyrone/swift,lorentey/swift,huonw/swift,gregomni/swift,shahmishal/swift,brentdax/swift,xedin/swift,devincoughlin/swift,jopamer/swift,uasys/swift,zisko/swift,gribozavr/swift,practicalswift/swift,zisko/swift,swiftix/swift,shajrawi/swift,allevato/swift,xwu/swift,return/swift,natecook1000/swift,rudkx/swift,amraboelela/swift,parkera/swift,huonw/swift,ahoppen/swift,shajrawi/swift,danielmartin/swift,OscarSwanros/swift,harlanhaskins/swift,apple/swift,lorentey/swift,austinzheng/swift,roambotics/swift,devincoughlin/swift,jckarter/swift,tkremenek/swift,zisko/swift,karwa/swift,jmgc/swift,jmgc/swift,atrick/swift,allevato/swift,sschiau/swift,natecook1000/swift,glessard/swift,jmgc/swift,apple/swift,airspeedswift/swift,jopamer/swift,practicalswift/swift,ahoppen/swift,aschwaighofer/swift,alblue/swift,allevato/swift,danielmartin/swift,lorentey/swift,jmgc/swift,aschwaighofer/swift,amraboelela/swift,airspeedswift/swift,alblue/swift,karwa/swift,glessard/swift,huonw/swift,allevato/swift,jckarter/swift,frootloops/swift,zisko/swift,frootloops/swift,shajrawi/swift,JGiola/swift,harlanhaskins/swift,karwa/swift,shajrawi/swift,aschwaighofer/swift,nathawes/swift,karwa/swift,rudkx/swift,benlangmuir/swift,zisko/swift,nathawes/swift,hooman/swift,CodaFi/swift,stephentyrone/swift,jopamer/swift,danielmartin/swift,gribozavr/swift,gribozavr/swift,benlangmuir/swift,swiftix/swift,atrick/swift,gregomni/swift,hooman/swift,deyton/swift,aschwaighofer/swift,apple/swift,rudkx/swift,harlanhaskins/swift,sschiau/swift,tjw/swift,devincoughlin/swift,sschiau/swift,austinzheng/swift,CodaFi/swift,danielmartin/swift,tkremenek/swift,OscarSwanros/swift,frootloops/swift,karwa/swift,tjw/swift,zisko/swift,swiftix/swift,rudkx/swift,karwa/swift,return/swift,nathawes/swift,airspeedswift/swift,benlangmuir/swift,swiftix/swift,karwa/swift,sschiau/swift,frootloops/swift,JGiola/swift,practicalswift/swift,benlangmuir/swift,stephentyrone/swift,uasys/swift,harlanhaskins/swift,benlangmuir/swift,huonw/swift,ahoppen/swift,huonw/swift,jmgc/swift,xedin/swift,CodaFi/swift,shahmishal/swift,airspeedswift/swift,hooman/swift,rudkx/swift,OscarSwanros/swift,rudkx/swift,shahmishal/swift,roambotics/swift,xwu/swift,lorentey/swift,practicalswift/swift,sschiau/swift,jmgc/swift,devincoughlin/swift,roambotics/swift,xedin/swift,shajrawi/swift,allevato/swift,shajrawi/swift,deyton/swift,gregomni/swift,hooman/swift,benlangmuir/swift,parkera/swift,brentdax/swift,jmgc/swift,glessard/swift,atrick/swift,shajrawi/swift,lorentey/swift,amraboelela/swift,parkera/swift,jckarter/swift,xwu/swift,brentdax/swift,natecook1000/swift,zisko/swift,parkera/swift,glessard/swift,ahoppen/swift,danielmartin/swift,tjw/swift,jopamer/swift,deyton/swift,stephentyrone/swift,sschiau/swift,xedin/swift,shahmishal/swift,parkera/swift,glessard/swift,shahmishal/swift,CodaFi/swift,lorentey/swift,harlanhaskins/swift,OscarSwanros/swift,brentdax/swift,tkremenek/swift,sschiau/swift,swiftix/swift,huonw/swift,practicalswift/swift,aschwaighofer/swift,nathawes/swift,xedin/swift,austinzheng/swift,apple/swift,brentdax/swift,alblue/swift,xedin/swift,return/swift,amraboelela/swift,swiftix/swift,milseman/swift,frootloops/swift,natecook1000/swift,tkremenek/swift,gribozavr/swift,uasys/swift,milseman/swift,deyton/swift,parkera/swift,return/swift,jopamer/swift,ahoppen/swift,jckarter/swift,lorentey/swift,harlanhaskins/swift,milseman/swift,uasys/swift,shajrawi/swift,jopamer/swift,aschwaighofer/swift,xedin/swift,alblue/swift,jckarter/swift,OscarSwanros/swift,jckarter/swift,milseman/swift,tjw/swift,tjw/swift,devincoughlin/swift,atrick/swift,atrick/swift,frootloops/swift,nathawes/swift,CodaFi/swift,milseman/swift,glessard/swift,jckarter/swift,deyton/swift,atrick/swift,deyton/sw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