[Docs] Minor edits to GenericsManifesto.md.
[Docs] Minor edits to GenericsManifesto.md.

Address comments by @CodaFi regarding capitalization.

lorentey/swift,xedin/swift,practicalswift/swift,nathawes/swift,glessard/swift,danielmartin/swift,roambotics/swift,allevato/swift,tkremenek/swift,gregomni/swift,harlanhaskins/swift,shahmishal/swift,nathawes/swift,lorentey/swift,tkremenek/swift,aschwaighofer/swift,rudkx/swift,roambotics/swift,alblue/swift,jopamer/swift,ahoppen/swift,benlangmuir/swift,devincoughlin/swift,JGiola/swift,airspeedswift/swift,sschiau/swift,allevato/swift,stephentyrone/swift,devincoughlin/swift,natecook1000/swift,practicalswift/swift,jmgc/swift,airspeedswift/swift,atrick/swift,devincoughlin/swift,alblue/swift,gregomni/swift,karwa/swift,danielmartin/swift,harlanhaskins/swift,xedin/swift,natecook1000/swift,shahmishal/swift,gregomni/swift,gregomni/swift,rudkx/swift,shajrawi/swift,CodaFi/swift,glessard/swift,jopamer/swift,glessard/swift,gregomni/swift,xwu/swift,sschiau/swift,shajrawi/swift,atrick/swift,tkremenek/swift,practicalswift/swift,shajrawi/swift,jopamer/swift,lorentey/swift,shahmishal/swift,airspeedswift/swift,danielmartin/swift,rudkx/swift,nathawes/swift,ahoppen/swift,benlangmuir/swift,nathawes/swift,austinzheng/swift,jckarter/swift,austinzheng/swift,jmgc/swift,karwa/swift,lorentey/swift,lorentey/swift,alblue/swift,jmgc/swift,amraboelela/swift,alblue/swift,jopamer/swift,shahmishal/swift,atrick/swift,airspeedswift/swift,roambotics/swift,xedin/swift,shahmishal/swift,JGiola/swift,brentdax/swift,sschiau/swift,parkera/swift,CodaFi/swift,devincoughlin/swift,amraboelela/swift,jopamer/swift,natecook1000/swift,xedin/swift,airspeedswift/swift,harlanhaskins/swift,allevato/swift,parkera/swift,xwu/swift,stephentyrone/swift,shajrawi/swift,airspeedswift/swift,xwu/swift,CodaFi/swift,gribozavr/swift,apple/swift,hooman/swift,amraboelela/swift,hooman/swift,practicalswift/swift,sschiau/swift,xedin/swift,allevato/swift,benlangmuir/swift,sschiau/swift,nathawes/swift,gribozavr/swift,devincoughlin/swift,rudkx/swift,gregomni/swift,jckarter/swift,allevato/swift,tkremenek/swift,atrick/swift,gribozavr/swift,roambotics/swift,harlanhaskins/swift,harlanhaskins/swift,hooman/swift,danielmartin/swift,lorentey/swift,hooman/swift,parkera/swift,ahoppen/swift,parkera/swift,gribozavr/swift,practicalswift/swift,karwa/swift,sschiau/swift,jopamer/swift,apple/swift,xwu/swift,roambotics/swift,lorentey/swift,brentdax/swift,apple/swift,jckarter/swift,parkera/swift,devincoughlin/swift,airspeedswift/swift,glessard/swift,austinzheng/swift,shahmishal/swift,devincoughlin/swift,xwu/swift,jmgc/swift,jckarter/swift,JGiola/swift,stephentyrone/swift,devincoughlin/swift,rudkx/swift,natecook1000/swift,apple/swift,hooman/swift,glessard/swift,danielmartin/swift,aschwaighofer/swift,brentdax/swift,shajrawi/swift,hooman/swift,shajrawi/swift,harlanhaskins/swift,gribozavr/swift,benlangmuir/swift,apple/swift,austinzheng/swift,xedin/swift,gribozavr/swift,xedin/swift,tkremenek/swift,tkremenek/swift,xwu/swift,austinzheng/swift,xwu/swift,alblue/swift,shahmishal/swift,natecook1000/swift,stephentyrone/swift,karwa/swift,amraboelela/swift,brentdax/swift,practicalswift/swift,aschwaighofer/swift,shajrawi/swift,ahoppen/swift,danielmartin/swift,aschwaighofer/swift,stephentyrone/swift,parkera/swift,roambotics/swift,JGiola/swift,JGiola/swift,gribozavr/swift,nathawes/swift,jckarter/swift,shajrawi/swift,jckarter/swift,allevato/swift,rudkx/swift,karwa/swift,alblue/swift,ahoppen/swift,brentdax/swift,aschwaighofer/swift,CodaFi/swift,CodaFi/swift,JGiola/swift,lorentey/swift,sschiau/swift,ahoppen/swift,jmgc/swift,parkera/swift,sschiau/swift,parkera/swift,karwa/swift,austinzheng/swift,practicalswift/swift,benlangmuir/swift,tkremenek/swift,austinzheng/swift,atrick/swift,benlangmuir/swift,gribozavr/swift,amraboelela/swift,amraboelela/swift,karwa/swift,danielmartin/swift,CodaFi/swift,alblue/swift,apple/swift,practicalswift/swift,shahmishal/swift,jckarter/swift,CodaFi/swift,aschwaighofer/swift,brentdax/swift,jmgc/swift,brentdax/swift,natecook1000/swift,jopamer/swift,allevato/swift,aschwaighofer/swift,hooman/swift,glessard/swift,stephentyrone/swift,amraboelela/swift,karwa/swift,harlanhaskins/swift,nathawes/swift,natecook1000/swift,xedin/swift,atrick/swift,jmgc/swift,stephentyrone/swift