SwitchOnNext - better example included

[nigelm187]

https://github.com/SoftwareAG/apama-rxepl/blob/master/docs/interfaces/IObservable.md#switchonnext

Below is a better example which I created for SwitchOnNext

any switchOnNextExample := Observable
    .fromValues([Observable.range(1,5).delay(1.0), Observable.fromValues([10,11,12,13,14,15])])
    .switchOnNext()
    .subscribe(LoggingSubscriber.create("SwitchOnNext Example"));

Which shows that the second Observable actioned as it arrived before the first due to the delay