docs: NativeAudio play documentation incorrect

[dylanvdmerwe]

For the NativeAudio plugin, the example says you use the play method like:

NativeAudio.play('uniqueId1').then(onSuccess, onError);

However this is not correct as later on in the docs (and in the TypeScript definitions) the play method takes an additional callback.

play(id, completeCallback)

http://ionicframework.com/docs/v2/native/nativeaudio/

[ihadeed]

Thanks

The callback is actually optional. I just fixed the typing and updated the docs.