Format sample code

hippo4j-example/hippo4j-spring-boot-starter-example/src/main/java/cn/hippo4j/example/server/Hippo4JServerExampleApplication.java

@@ -28,5 +28,4 @@ public class Hippo4JServerExampleApplication {
     public static void main(String[] args) {
         SpringApplication.run(Hippo4JServerExampleApplication.class, args);
     }
-
 }