Minor style tweaks for SignalProducer.buffer()
Minor style tweaks for SignalProducer.buffer()

RuiAAPeres/ReactiveCocoa,sandyway/ReactiveCocoa,ikesyo/ReactiveCocoa,victorlin/ReactiveCocoa,ikesyo/ReactiveCocoa,andersio/ReactiveCocoa,andersio/ReactiveCocoa,rpowelll/ReactiveCocoa,rpowelll/ReactiveCocoa,smilypeda/ReactiveCocoa,sandyway/ReactiveCocoa,walkingsmarts/ReactiveCocoa,victorlin/ReactiveCocoa,tzongw/ReactiveCocoa,walkingsmarts/ReactiveCocoa,calebd/ReactiveCocoa,tzongw/ReactiveCocoa,rpowelll/ReactiveCocoa,walkingsmarts/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,smilypeda/ReactiveCocoa,ohwutup/ReactiveCocoa,calebd/ReactiveCocoa,tzongw/ReactiveCocoa,calebd/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ohwutup/ReactiveCocoa,sandyway/ReactiveCocoa,victorlin/ReactiveCocoa,andersio/ReactiveCocoa,ohwutup/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,RuiAAPeres/ReactiveCocoa,smilypeda/ReactiveCocoa,ReactiveCocoa/ReactiveSwift