[docs] Add some Objective-C interop stuff to Modules.rst.
[docs] Add some Objective-C interop stuff to Modules.rst.

Doesn't feel very complete, but I'm not sure how much there is to say here.
The user model is either that it works, or it doesn't.

Swift SVN r8810

jckarter/swift,frootloops/swift,allevato/swift,tardieu/swift,calebd/swift,jopamer/swift,danielmartin/swift,brentdax/swift,uasys/swift,return/swift,IngmarStein/swift,codestergit/swift,jtbandes/swift,stephentyrone/swift,sdulal/swift,deyton/swift,kentya6/swift,devincoughlin/swift,MukeshKumarS/Swift,emilstahl/swift,tinysun212/swift-windows,sdulal/swift,ken0nek/swift,jmgc/swift,gregomni/swift,jmgc/swift,shahmishal/swift,calebd/swift,SwiftAndroid/swift,IngmarStein/swift,danielmartin/swift,arvedviehweger/swift,allevato/swift,shajrawi/swift,bitjammer/swift,Jnosh/swift,zisko/swift,djwbrown/swift,gribozavr/swift,gottesmm/swift,shahmishal/swift,kperryua/swift,modocache/swift,kstaring/swift,dreamsxin/swift,amraboelela/swift,xwu/swift,tardieu/swift,tinysun212/swift-windows,tardieu/swift,Ivacker/swift,arvedviehweger/swift,zisko/swift,uasys/swift,slavapestov/swift,kusl/swift,jopamer/swift,OscarSwanros/swift,return/swift,djwbrown/swift,LeoShimonaka/swift,tinysun212/swift-windows,deyton/swift,huonw/swift,gmilos/swift,sschiau/swift,gmilos/swift,mightydeveloper/swift,tinysun212/swift-windows,tjw/swift,ben-ng/swift,JGiola/swift,russbishop/swift,hughbe/swift,tardieu/swift,alblue/swift,nathawes/swift,ahoppen/swift,swiftix/swift,lorentey/swift,karwa/swift,slavapestov/swift,jtbandes/swift,xedin/swift,milseman/swift,apple/swift,natecook1000/swift,slavapestov/swift,karwa/swift,ahoppen/swift,sdulal/swift,emilstahl/swift,MukeshKumarS/Swift,sdulal/swift,kstaring/swift,glessard/swift,JaSpa/swift,ben-ng/swift,karwa/swift,milseman/swift,KrishMunot/swift,emilstahl/swift,manavgabhawala/swift,manavgabhawala/swift,kusl/swift,sschiau/swift,dduan/swift,alblue/swift,gribozavr/swift,gottesmm/swift,nathawes/swift,kusl/swift,jmgc/swift,deyton/swift,swiftix/swift.old,johnno1962d/swift,austinzheng/swift,ken0nek/swift,austinzheng/swift,codestergit/swift,IngmarStein/swift,shahmishal/swift,slavapestov/swift,devincoughlin/swift,bitjammer/swift,swiftix/swift,djwbrown/swift,emilstahl/swift,rudkx/swift,sdulal/swift,jopamer/swift,gregomni/swift,kstaring/swift,jopamer/swift,hughbe/swift,apple/swift,SwiftAndroid/swift,shajrawi/swift,djwbrown/swift,rudkx/swift,frootloops/swift,lorentey/swift,harlanhaskins/swift,devincoughlin/swift,ahoppen/swift,JaSpa/swift,khizkhiz/swift,practicalswift/swift,atrick/swift,russbishop/swift,brentdax/swift,hooman/swift,harlanhaskins/swift,rudkx/swift,gribozavr/swift,apple/swift,huonw/swift,mightydeveloper/swift,natecook1000/swift,tkremenek/swift,xedin/swift,shajrawi/swift,allevato/swift,bitjammer/swift,tjw/swift,kusl/swift,bitjammer/swift,kentya6/swift,felix91gr/swift,nathawes/swift,ken0nek/swift,SwiftAndroid/swift,return/swift,hughbe/swift,alblue/swift,kstaring/swift,swiftix/swift.old,adrfer/swift,Ivacker/swift,ken0nek/swift,khizkhiz/swift,lorentey/swift,swiftix/swift.old,therealbnut/swift,allevato/swift,KrishMunot/swift,ahoppen/swift,benlangmuir/swift,cbrentharris/swift,karwa/swift,amraboelela/swift,alblue/swift,swiftix/swift.old,KrishMunot/swift,harlanhaskins/swift,gregomni/swift,jmgc/swift,gribozavr/swift,aschwaighofer/swift,johnno1962d/swift,amraboelela/swift,jckarter/swift,practicalswift/swift,atrick/swift,JGiola/swift,calebd/swift,apple/swift,jtbandes/swift,mightydeveloper/swift,djwbrown/swift,practicalswift/swift,CodaFi/swift,devincoughlin/swift,xwu/swift,CodaFi/swift,ken0nek/swift,OscarSwanros/swift,roambotics/swift,adrfer/swift,SwiftAndroid/swift,hughbe/swift,sschiau/swift,gregomni/swift,ben-ng/swift,jtbandes/swift,uasys/swift,sschiau/swift,dduan/swift,JaSpa/swift,swiftix/swift.old,MukeshKumarS/Swift,felix91gr/swift,russbishop/swift,johnno1962d/swift,roambotics/swift,parkera/swift,russbishop/swift,practicalswift/swift,LeoShimonaka/swift,gottesmm/swift,adrfer/swift,Jnosh/swift,devincoughlin/swift,therealbnut/swift,parkera/swift,shajrawi/swift,roambotics/swift,emilstahl/swift,benlangmuir/swift,Jnosh/swift,rudkx/swift,zisko/swift,lorentey/swift,djwbrown/swift,gribozavr/swift,tkremenek/swift,OscarSwanros/swift,LeoShimonaka/swift,Ivacker/swift,tjw/swift,swiftix/swift.old,MukeshKumarS/Swift,gottesmm/swift,deyton/swift,felix91gr/swift,stephentyrone/swift,CodaFi/swift,jtbandes/swift,LeoShimonaka/swift,parkera/swift,manavgabhawala/swift,JaSpa/swift,rudkx/swift,hughbe/swift,bitjammer/swift,johnno1962d/swift,gmilos/swift,alblue/swift,airspeedswift/swift,swiftix/swift.old,xwu/swift,sschiau/swift,ken0nek/swift,zisko/swift,JGiola/swift,calebd/swift,kperryua/swift,xwu/swift,Jnosh/swift,adrfer/swift,CodaFi/swift,OscarSwanros/swift,Jnosh/swift,alblue/swift,uasys/swift,shajrawi/swift,hooman/swift,sschiau/swift,sdulal/swift,karwa/swift,glessard/swift,kstaring/swift,swiftix/swift,JGiola/swift,gregomni/swift,jopamer/swift,stephentyrone/swift,slavapestov/swift,emilstahl/swift,kentya6/swift,tkremenek/swift,modocache/swift,ben-ng/swift,devincoughlin/swift,arvedviehweger/swift,tkremenek/swift,mightydeveloper/swift,cbrentharris/swift,Ivacker/swift,ben-ng/swift,emilstahl/swift,shahmishal/swift,adrfer/swift,kperryua/swift,roambotics/swift,kperryua/swift,emilstahl/swift,huonw/swift,atrick/swift,LeoShimonaka/swift,IngmarStein/swift,Jnosh/swift,hooman/swift,ken0nek/swift,natecook1000/swift,MukeshKumarS/Swift,practicalswift/swift,JaSpa/swift,uasys/swift,hooman/swift,bitjammer/swift,return/swift,shajrawi/swift,jopamer/swift,nathawes/swift,allevato/swift,codestergit/swift,gottesmm/swift,xedin/swift,parkera/swift,johnno1962d/swift,ben-ng/swift,aschwaighofer/swift,shahmishal/swift,russbishop/swift,danielmartin/swift,kentya6/swift,hughbe/swift,danielmartin/swift,huonw/swift,JGiola/swift,tardieu/swift,manavgabhawala/swift,jckarter/swift,roambotics/swift,return/swift,lorentey/swift,jmgc/swift,gmilos/swift,jckarter/swift,jckarter/swift,kstaring/swift,stephentyrone/swift,modocache/swift,manavgabhawala/swift,dduan/swift,aschwaighofer/swift,JaSpa/swift,felix91gr/swift,kentya6/swift,sschiau/swift,shajrawi/swift,KrishMunot/swift,benlangmuir/swift,JaSpa/swift,kstaring/swift,nathawes/swift,shahmishal/swift,calebd/swift,zisko/swift,tardieu/swift,IngmarStein/swift,airspeedswift/swift,practicalswift/swift,tinysun212/swift-windows,therealbnut/swift,rudkx/swift,lorentey/swift,gribozavr/swift,dduan/swift,austinzheng/swift,codestergit/swift,milseman/swift,jckarter/swift,nathawes/swift,parkera/swift,gottesmm/swift,return/swift,frootloops/swift,CodaFi/swift,airspeedswift/swift,tkremenek/swift,ahoppen/swift,dduan/swift,swiftix/swift,tinysun212/swift-windows,aschwaighofer/swift,lorentey/swift,milseman/swift,milseman/swift,practicalswift/swift,OscarSwanros/swift,benlangmuir/swift,felix91gr/swift,gribozavr/swift,mightydeveloper/swift,kusl/swift,sdulal/swift,parkera/swift,modocache/swift,harlanhaskins/swift,SwiftAndroid/swift,khizkhiz/swift,dreamsxin/swift,russbishop/swift,nathawes/swift,therealbnut/swift,gottesmm/swift,hughbe/swift,karwa/swift,calebd/swift,huonw/swift,OscarSwanros/swift,frootloops/swift,jtbandes/swift,apple/swift,practicalswift/swift,brentdax/swift,atrick/swift,xedin/swift,hooman/swift,SwiftAndroid/swift,glessard/swift,adrfer/swift,danielmartin/swift,xedin/swift,CodaFi/swift,milseman/swift,slavapestov/swift,harlanhaskins/swift,LeoShimonaka/swift,shahmishal/swift,xedin/swift,jckarter/swift,KrishMunot/swift,xedin/swift,aschwaighofer/swift,parkera/swift,manavgabhawala/swift,bitjammer/swift,sdulal/swift,kusl/swift,CodaFi/swift,modocache/swift,IngmarStein/swift,airspeedswift/swift,karwa/swift,sschiau/swift,natecook1000/swift,brentdax/swift,khizkhiz/swift,Ivacker/swift,cbrentharris/swift,Jnosh/swift,ben-ng/swift,codestergit/swift,airspeedswift/swift,arvedviehweger/swift,LeoShimonaka/swift,swiftix/swift,tjw/swift,atrick/swift,MukeshKumarS/Swift,natecook1000/swift,hooman/swift,frootloops/swift,benlangmuir/swift,kentya6/swift,LeoShimonaka/swift,stephentyrone/swift,jmgc/swift,uasys/swift,natecook1000/swift,frootloops/swift,tinysun212/swift-windows,allevato/swift,kusl/swift,glessard/swift,cbrentharris/swift,frootloops/swift,return/swift,dduan/swift,JGiola/swift,swiftix/swift.old,jopamer/swift,KrishMunot/swift,johnno1962d/swift,Ivacker/swift,mightydeveloper/swift,johnno1962d/swift,gmilos/swift,apple/swift,airspeedswift/swift,arvedviehweger/swift,russbishop/swift,swiftix/swift,cbrentharris/swift,mightydeveloper/swift,tardieu/swift,amraboelela/swift,airspeedswift/swift,natecook1000/swift,jmgc/swift,deyton/swift,austinzheng/swift,deyton/swift,devincoughlin/swift,dduan/swift,codestergit/swift,glessard/swift,felix91gr/swift,brentdax/swift,mightydeveloper/swift,OscarSwanros/swift,kperryua/swift,brentdax/swift,danielmartin/swift,kentya6/swift,lorentey/swift,xwu/swift,kentya6/swift,xwu/swift,amraboelela/swift,slavapestov/swift,harlanhaskins/swift,MukeshKumarS/Swift,karwa/swift,benlangmuir/swift,xwu/swift,kperryua/swift,SwiftAndroid/swift,aschwaighofer/swift,IngmarStein/swift,stephentyrone/swift,KrishMunot/swift,deyton/swift,gregomni/swift,brentdax/swift,shajrawi/swift,Ivacker/swift,austinzheng/swift,gmilos/swift,adrfer/swift,devincoughlin/swift,therealbnut/swift,calebd/swift,khizkhiz/swift,tjw/swift,milseman/swift,ahoppen/swift,amraboelela/swift,modocache/swift,allevato/swift,khizkhiz/swift,tjw/swift,gribozavr/swift,cbrentharris/swift,cbrentharris/swift,manavgabhawala/swift,kperryua/swift,shahmishal/swift,jtbandes/swift,tjw/swift,parkera/swift,khizkhiz/swift,huonw/swift,stephentyrone/swift,arvedviehweger/swift,therealbnut/swift,zisko/swift,alblue/swift,therealbnut/swift,codestergit/swift,kusl/swift,glessard/swift,harlanhaskins/swift,amraboelela/swift,austinzheng/swift,tkremenek/swift,gmilos/swift,huonw/swift,xedin/swift,uasys/swift,modocache/swift,roambotics/swift,aschwaighofer/swift,tkremenek/swift,djwbrown/swift,hooman/swift,zisko/swift,danielmartin/swift,Ivacker/swift,swiftix/swift,arvedviehweger/swift,felix91gr/swift,cbrentharris/swift,austinzheng/swift,atrick/swift