Revert "stdlib: eliminate unused typealias and tidy up the doc comment"
Revert "stdlib: eliminate unused typealias and tidy up the doc comment"

This reverts commit r30458.

This is breaking test 'Swift :: stdlib/Algorithm.swift.gyb'

Swift SVN r30468

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