[docs] Add "WIP" and "DNM" to Lexicon.rst (#19329)
[docs] Add "WIP" and "DNM" to Lexicon.rst (#19329)

"WIP" is hardly unique to Swift, but it is a three-letter acronym that
someone might not have encountered before. "DNM" seems to have arisen
organically over the last few weeks.
hooman/swift,hooman/swift,practicalswift/swift,danielmartin/swift,CodaFi/swift,harlanhaskins/swift,austinzheng/swift,stephentyrone/swift,gregomni/swift,allevato/swift,stephentyrone/swift,nathawes/swift,danielmartin/swift,lorentey/swift,gribozavr/swift,gribozavr/swift,benlangmuir/swift,danielmartin/swift,lorentey/swift,ahoppen/swift,karwa/swift,hooman/swift,roambotics/swift,jckarter/swift,austinzheng/swift,brentdax/swift,jckarter/swift,danielmartin/swift,xedin/swift,jckarter/swift,gregomni/swift,rudkx/swift,roambotics/swift,lorentey/swift,lorentey/swift,nathawes/swift,shahmishal/swift,aschwaighofer/swift,practicalswift/swift,karwa/swift,ahoppen/swift,lorentey/swift,xedin/swift,stephentyrone/swift,shahmishal/swift,tkremenek/swift,airspeedswift/swift,harlanhaskins/swift,CodaFi/swift,lorentey/swift,amraboelela/swift,apple/swift,benlangmuir/swift,xedin/swift,harlanhaskins/swift,apple/swift,devincoughlin/swift,xedin/swift,apple/swift,tkremenek/swift,amraboelela/swift,apple/swift,roambotics/swift,jmgc/swift,danielmartin/swift,sschiau/swift,roambotics/swift,gregomni/swift,amraboelela/swift,allevato/swift,glessard/swift,parkera/swift,stephentyrone/swift,jmgc/swift,gregomni/swift,roambotics/swift,airspeedswift/swift,aschwaighofer/swift,airspeedswift/swift,devincoughlin/swift,alblue/swift,austinzheng/swift,xwu/swift,gribozavr/swift,JGiola/swift,amraboelela/swift,lorentey/swift,allevato/swift,atrick/swift,jmgc/swift,shahmishal/swift,JGiola/swift,xedin/swift,xwu/swift,shajrawi/swift,karwa/swift,rudkx/swift,devincoughlin/swift,parkera/swift,tkremenek/swift,tkremenek/swift,sschiau/swift,shahmishal/swift,amraboelela/swift,hooman/swift,karwa/swift,glessard/swift,benlangmuir/swift,tkremenek/swift,nathawes/swift,rudkx/swift,gribozavr/swift,atrick/swift,shahmishal/swift,practicalswift/swift,jmgc/swift,hooman/swift,aschwaighofer/swift,xedin/swift,jmgc/swift,alblue/swift,jmgc/swift,ahoppen/swift,karwa/swift,shajrawi/swift,sschiau/swift,shahmishal/swift,allevato/swift,glessard/swift,karwa/swift,airspeedswift/swift,CodaFi/swift,danielmartin/swift,harlanhaskins/swift,practicalswift/swift,sschiau/swift,apple/swift,karwa/swift,xedin/swift,devincoughlin/swift,gribozavr/swift,alblue/swift,austinzheng/swift,nathawes/swift,practicalswift/swift,gribozavr/swift,benlangmuir/swift,shajrawi/swift,practicalswift/swift,alblue/swift,alblue/swift,hooman/swift,devincoughlin/swift,allevato/swift,alblue/swift,atrick/swift,aschwaighofer/swift,jckarter/swift,shajrawi/swift,jckarter/swift,gribozavr/swift,xwu/swift,rudkx/swift,devincoughlin/swift,amraboelela/swift,brentdax/swift,amraboelela/swift,shajrawi/swift,jckarter/swift,gregomni/swift,alblue/swift,karwa/swift,rudkx/swift,gregomni/swift,atrick/swift,rudkx/swift,nathawes/swift,shahmishal/swift,xwu/swift,CodaFi/swift,tkremenek/swift,gribozavr/swift,tkremenek/swift,practicalswift/swift,sschiau/swift,brentdax/swift,austinzheng/swift,shajrawi/swift,shahmishal/swift,parkera/swift,stephentyrone/swift,apple/swift,parkera/swift,ahoppen/swift,ahoppen/swift,JGiola/swift,austinzheng/swift,stephentyrone/swift,parkera/swift,xedin/swift,brentdax/swift,devincoughlin/swift,harlanhaskins/swift,brentdax/swift,xwu/swift,brentdax/swift,sschiau/swift,CodaFi/swift,parkera/swift,CodaFi/swift,JGiola/swift,devincoughlin/swift,parkera/swift,lorentey/swift,allevato/swift,CodaFi/swift,ahoppen/swift,JGiola/swift,benlangmuir/swift,xwu/swift,austinzheng/swift,allevato/swift,atrick/swift,jmgc/swift,danielmartin/swift,harlanhaskins/swift,roambotics/swift,brentdax/swift,atrick/swift,airspeedswift/swift,parkera/swift,harlanhaskins/swift,sschiau/swift,nathawes/swift,airspeedswift/swift,aschwaighofer/swift,glessard/swift,sschiau/swift,glessard/swift,hooman/swift,JGiola/swift,benlangmuir/swift,aschwaighofer/swift,jckarter/swift,shajrawi/swift,shajrawi/swift,airspeedswift/swift,stephentyrone/swift,glessard/swift,practicalswift/swift,xwu/swift,nathawes/swift,aschwaighofer/swift