Clarify behaviour of ObserverMethodConfigurator<T> read

It's not clear what should happen in case if you are using ObserverMethodConfigurator and attempting to read from a method (Method, AnnotatedMethod) which doesn't have any parameter annotated @Observes. E.g something like this in ABD lifecycle event ("observesMelon" doesn't have any @Observes):

Method melonMethod = FruitObserver.class.getMethod("observesMelon", Melon.class);
abd.addObserverMethod().read(melonMethod)