BAEL-112 - custom validator - format fixes

spring-mvc-java/src/main/java/com/baeldung/customvalidator/ContactNumberConstraint.java

@@ -11,12 +11,14 @@ import javax.validation.Payload;
 
 @Documented
 @Constraint(validatedBy = ContactNumberValidator.class)
-@Target( { ElementType.METHOD, ElementType.FIELD })
+@Target({ElementType.METHOD, ElementType.FIELD})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface ContactNumberConstraint {
 
     String message() default "Invalid phone number";
+
     Class<?>[] groups() default {};
+
     Class<? extends Payload>[] payload() default {};
-    
+
 }