Use correct parent interface PersonRepository example.
disambiguate the readme with the current way to implement the reactive repository
@@ -28,7 +28,7 @@ Here is a quick teaser of an application using Spring Data Repositories in Java:
[source,java]
----
-public interface PersonRepository extends CrudRepository<Person, Long> {
+public interface PersonRepository extends ReactiveCrudRepository<Person, Long> {
@Query("SELECT * FROM person WHERE lastname = :lastname")
Flux<Person> findByLastname(String lastname);
