Incorrect method in the documentation

Hi

I followed this guide: https://jersey.github.io/documentation/latest/sse.html and this code example:

```
@GET
@Produces(MediaType.SERVER_SENT_EVENTS)
public void getServerSentEvents(@Context SseEventSink eventSink, @Context Sse sse) {
new Thread(() -> {
for (int i = 0; i < 10; i++) {
// ... code that waits 1 second
final OutboundSseEvent event = sse.newEventBuilder()
.name("message-to-client")
.data(String.class, "Hello world " + i + "!")
.build();
eventSink.onNext(event);
}
}).start();
}
```

However it seems to be outdated as eventSink doesn't have onNext method now. The replacement is send method that does the same.