[Docs] [AutoDiff] Fix typos in differentiable programming manifesto.
[Docs] [AutoDiff] Fix typos in differentiable programming manifesto.

- `@differential(linear)` -> `@differentiable(linear)`
- Fix derivative registration for `ElementaryFunctions` requirements.

harlanhaskins/swift,benlangmuir/swift,JGiola/swift,gregomni/swift,xwu/swift,benlangmuir/swift,jmgc/swift,parkera/swift,xwu/swift,rudkx/swift,rudkx/swift,allevato/swift,harlanhaskins/swift,karwa/swift,harlanhaskins/swift,tkremenek/swift,roambotics/swift,atrick/swift,atrick/swift,apple/swift,CodaFi/swift,allevato/swift,allevato/swift,tkremenek/swift,glessard/swift,nathawes/swift,ahoppen/swift,jmgc/swift,CodaFi/swift,gribozavr/swift,tkremenek/swift,harlanhaskins/swift,ahoppen/swift,apple/swift,lorentey/swift,harlanhaskins/swift,hooman/swift,gregomni/swift,airspeedswift/swift,tkremenek/swift,JGiola/swift,jmgc/swift,glessard/swift,airspeedswift/swift,karwa/swift,rudkx/swift,tkremenek/swift,atrick/swift,benlangmuir/swift,gribozavr/swift,parkera/swift,xwu/swift,airspeedswift/swift,jckarter/swift,glessard/swift,atrick/swift,stephentyrone/swift,ahoppen/swift,stephentyrone/swift,ahoppen/swift,hooman/swift,lorentey/swift,lorentey/swift,harlanhaskins/swift,jmgc/swift,roambotics/swift,parkera/swift,lorentey/swift,roambotics/swift,xwu/swift,CodaFi/swift,karwa/swift,xwu/swift,airspeedswift/swift,parkera/swift,jmgc/swift,xwu/swift,nathawes/swift,lorentey/swift,lorentey/swift,lorentey/swift,aschwaighofer/swift,jckarter/swift,nathawes/swift,JGiola/swift,hooman/swift,jckarter/swift,airspeedswift/swift,apple/swift,stephentyrone/swift,atrick/swift,glessard/swift,harlanhaskins/swift,allevato/swift,karwa/swift,tkremenek/swift,hooman/swift,gregomni/swift,JGiola/swift,jmgc/swift,CodaFi/swift,CodaFi/swift,karwa/swift,lorentey/swift,JGiola/swift,gregomni/swift,aschwaighofer/swift,CodaFi/swift,tkremenek/swift,rudkx/swift,airspeedswift/swift,parkera/swift,jckarter/swift,gribozavr/swift,gribozavr/swift,aschwaighofer/swift,gribozavr/swift,roambotics/swift,jckarter/swift,allevato/swift,ahoppen/swift,roambotics/swift,jckarter/swift,karwa/swift,atrick/swift,hooman/swift,aschwaighofer/swift,gribozavr/swift,stephentyrone/swift,gribozavr/swift,benlangmuir/swift,allevato/swift,gregomni/swift,rudkx/swift,nathawes/swift,glessard/swift,parkera/swift,apple/swift,jckarter/swift,benlangmuir/swift,hooman/swift,karwa/swift,stephentyrone/swift,nathawes/swift,allevato/swift,JGiola/swift,stephentyrone/swift,xwu/swift,glessard/swift,rudkx/swift,stephentyrone/swift,nathawes/swift,ahoppen/swift,parkera/swift,CodaFi/swift,hooman/swift,aschwaighofer/swift,parkera/swift,airspeedswift/swift,aschwaighofer/swift,apple/swift,gribozavr/swift,nathawes/swift,apple/swift,karwa/swift,roambotics/swift,gregomni/swift,jmgc/swift,aschwaighofer/swift,benlangmuir/swift