3.7 Fixed example

Author: Froussios

Part 3 - Taming the sequence/7. Custom operators.md

@@ -280,7 +280,8 @@ Observable<Integer> source = Observable.create(o -> {
 	o.onCompleted();
 });
 
-source.subscribe(
+source.doOnUnsubscribe(() -> System.out.println("Unsubscribed"))
+	.subscribe(
 		System.out::println,
 		System.out::println,
 		() -> System.out.println("Completed"));