Polishing.

Formatting.
Clarifying what is demonstrated a little.

Original pull request #668

Author: schauder

jpa/interceptors/src/main/java/example/springdata/jpa/interceptors/Customer.java

@@ -22,10 +22,13 @@
 @Entity
 public class Customer {
 
-	@Id @GeneratedValue Long id;
+	@Id
+	@GeneratedValue
+	Long id;
 
 	String firstname;
 	String lastname;
+
 	@Override
 	public String toString() {
 		return "Customer{" +

jpa/interceptors/src/test/java/example/springdata/jpa/interceptors/InterceptorIntegrationTest.java

@@ -30,12 +30,13 @@ class InterceptorIntegrationTest {
 	@Autowired CustomerRepository repository;
 
 	@Test
-	void foo() {
+	void demonstrateInterceptor() {
 
 		var customer = new Customer();
 		customer.firstname = "Dave";
 		customer.lastname = "Matthews";
 
+		// observer Log output from ApplicationConfiguration.interceptor
 		repository.save(customer);
 	}
 }