[Fix] Data sources example typo.
[Fix] Data sources example typo.

KyoheiG3/RxSwift,KyoheiG3/RxSwift,kzaher/RxSwift,cfraz89/RxSwift,cfraz89/RxSwift,ReactiveX/RxSwift,kzaher/RxSwift,kzaher/RxSwift,cfraz89/RxSwift,ReactiveX/RxSwift,KyoheiG3/RxSwift,ReactiveX/RxSwift,kzaher/RxSwift,cfraz89/RxSwift