Improve sample code of `deriveHashable_hashValue` (#13273)
Improve sample code of `deriveHashable_hashValue` (#13273)

Seems `SomeEnumWithAssociatedValues` implements require `result` initial value.
alblue/swift,stephentyrone/swift,gribozavr/swift,practicalswift/swift,sschiau/swift,gribozavr/swift,brentdax/swift,rudkx/swift,tkremenek/swift,jmgc/swift,alblue/swift,glessard/swift,karwa/swift,jmgc/swift,glessard/swift,parkera/swift,natecook1000/swift,huonw/swift,zisko/swift,parkera/swift,xwu/swift,huonw/swift,aschwaighofer/swift,harlanhaskins/swift,sschiau/swift,apple/swift,roambotics/swift,tkremenek/swift,roambotics/swift,allevato/swift,jckarter/swift,jmgc/swift,zisko/swift,brentdax/swift,shahmishal/swift,nathawes/swift,parkera/swift,JGiola/swift,karwa/swift,parkera/swift,jopamer/swift,nathawes/swift,austinzheng/swift,tjw/swift,devincoughlin/swift,karwa/swift,CodaFi/swift,airspeedswift/swift,CodaFi/swift,glessard/swift,tjw/swift,devincoughlin/swift,devincoughlin/swift,parkera/swift,zisko/swift,lorentey/swift,frootloops/swift,shahmishal/swift,tkremenek/swift,frootloops/swift,shajrawi/swift,airspeedswift/swift,benlangmuir/swift,benlangmuir/swift,ahoppen/swift,lorentey/swift,parkera/swift,benlangmuir/swift,ahoppen/swift,CodaFi/swift,aschwaighofer/swift,rudkx/swift,lorentey/swift,natecook1000/swift,harlanhaskins/swift,practicalswift/swift,practicalswift/swift,lorentey/swift,devincoughlin/swift,apple/swift,ahoppen/swift,xedin/swift,austinzheng/swift,shahmishal/swift,huonw/swift,shahmishal/swift,brentdax/swift,allevato/swift,austinzheng/swift,xedin/swift,tjw/swift,stephentyrone/swift,lorentey/swift,xwu/swift,lorentey/swift,frootloops/swift,zisko/swift,hooman/swift,benlangmuir/swift,devincoughlin/swift,jckarter/swift,hooman/swift,danielmartin/swift,sschiau/swift,nathawes/swift,jckarter/swift,gribozavr/swift,tkremenek/swift,atrick/swift,roambotics/swift,tkremenek/swift,jopamer/swift,JGiola/swift,austinzheng/swift,frootloops/swift,CodaFi/swift,xedin/swift,lorentey/swift,alblue/swift,CodaFi/swift,nathawes/swift,aschwaighofer/swift,gregomni/swift,tkremenek/swift,gregomni/swift,shajrawi/swift,nathawes/swift,apple/swift,gribozavr/swift,CodaFi/swift,jopamer/swift,glessard/swift,allevato/swift,atrick/swift,frootloops/swift,allevato/swift,stephentyrone/swift,roambotics/swift,danielmartin/swift,karwa/swift,gregomni/swift,shajrawi/swift,alblue/swift,gribozavr/swift,shajrawi/swift,stephentyrone/swift,rudkx/swift,shahmishal/swift,shajrawi/swift,amraboelela/swift,tkremenek/swift,amraboelela/swift,jopamer/swift,atrick/swift,harlanhaskins/swift,shajrawi/swift,hooman/swift,jopamer/swift,natecook1000/swift,shajrawi/swift,natecook1000/swift,nathawes/swift,practicalswift/swift,tjw/swift,benlangmuir/swift,harlanhaskins/swift,stephentyrone/swift,nathawes/swift,ahoppen/swift,zisko/swift,karwa/swift,sschiau/swift,atrick/swift,hooman/swift,airspeedswift/swift,aschwaighofer/swift,amraboelela/swift,jmgc/swift,atrick/swift,austinzheng/swift,harlanhaskins/swift,gregomni/swift,gregomni/swift,brentdax/swift,tjw/swift,shajrawi/swift,xwu/swift,hooman/swift,practicalswift/swift,jckarter/swift,gribozavr/swift,austinzheng/swift,airspeedswift/swift,benlangmuir/swift,atrick/swift,xwu/swift,sschiau/swift,hooman/swift,roambotics/swift,amraboelela/swift,jckarter/swift,harlanhaskins/swift,ahoppen/swift,natecook1000/swift,danielmartin/swift,zisko/swift,stephentyrone/swift,parkera/swift,harlanhaskins/swift,aschwaighofer/swift,danielmartin/swift,frootloops/swift,allevato/swift,natecook1000/swift,airspeedswift/swift,danielmartin/swift,CodaFi/swift,karwa/swift,xwu/swift,amraboelela/swift,roambotics/swift,gribozavr/swift,jckarter/swift,practicalswift/swift,rudkx/swift,amraboelela/swift,gregomni/swift,danielmartin/swift,huonw/swift,glessard/swift,huonw/swift,frootloops/swift,shahmishal/swift,jmgc/swift,karwa/swift,shahmishal/swift,rudkx/swift,aschwaighofer/swift,tjw/swift,apple/swift,allevato/swift,karwa/swift,devincoughlin/swift,jmgc/swift,practicalswift/swift,xwu/swift,zisko/swift,xedin/swift,alblue/swift,glessard/swift,airspeedswift/swift,xedin/swift,brentdax/swift,xwu/swift,ahoppen/swift,brentdax/swift,xedin/swift,sschiau/swift,allevato/swift,jopamer/swift,apple/swift,shahmishal/swift,JGiola/swift,JGiola/swift,gribozavr/swift,brentdax/swift,sschiau/swift,lorentey/swift,tjw/swift,apple/swift,devincoughlin/swift,rudkx/swift,sschiau/swift,parkera/swift,practicalswift/swift,alblue/swift,amraboelela/swift,xedin/swift,hooman/swift,jmgc/swift,aschwaighofer/swift,danielmartin/swift,airspeedswift/swift,jopamer/swift,huonw/swift,natecook1000/swift,alblue/swift,huonw/swift,JGiola/swift,xedin/swift,JGiola/swift,austinzheng/swift,jckarter/swift,devincoughlin/swift,stephentyrone/swift