Fix code snippet in change streams reference documentation.

Closes: #4376

src/main/asciidoc/reference/change-streams.adoc

@@ -28,7 +28,7 @@ MessageListenerContainer container = new DefaultMessageListenerContainer(templat
 container.start();                                                                                              <1>
 
 MessageListener<ChangeStreamDocument<Document>, User> listener = System.out::println;                           <2>
-ChangeStreamRequestOptions options = new ChangeStreamRequestOptions("user", ChangeStreamOptions.empty()); <3>
+ChangeStreamRequestOptions options = new ChangeStreamRequestOptions("db", "user", ChangeStreamOptions.empty()); <3>
 
 Subscription subscription = container.register(new ChangeStreamRequest<>(listener, options), User.class);       <4>