Add release note for SE-0302 "Sendable and @Sendable closures"
Add release note for SE-0302 "Sendable and @Sendable closures"

ahoppen/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,atrick/swift,atrick/swift,JGiola/swift,benlangmuir/swift,ahoppen/swift,roambotics/swift,roambotics/swift,rudkx/swift,gregomni/swift,JGiola/swift,apple/swift,rudkx/swift,apple/swift,rudkx/swift,roambotics/swift,gregomni/swift,benlangmuir/swift,apple/swift,gregomni/swift,ahoppen/swift,glessard/swift,atrick/swift,benlangmuir/swift,apple/swift,atrick/swift,gregomni/swift,roambotics/swift,benlangmuir/swift,rudkx/swift,benlangmuir/swift,JGiola/swift,glessard/swift,glessard/swift,roambotics/swift,JGiola/swift,JGiola/swift,gregomni/swift,rudkx/swift,ahoppen/swift,glessard/swift,atrick/swift,roambotics/swift,apple/swift,gregomni/swift,ahoppen/swift,apple/swift,glessard/swift,atrick/swift,JGiola/swift,rudkx/swift