[Clang importer] Improve a comment about block types and bridging.
[Clang importer] Improve a comment about block types and bridging.

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