[CodeCompletion] Remove invalid `using namespace` in PossibleParamInfo.h
[CodeCompletion] Remove invalid `using namespace` in PossibleParamInfo.h

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