Polish "Add JUnit Jupiter sample application"

Closes gh-8048

spring-boot-samples/spring-boot-sample-junit-jupiter/pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+		 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<!-- Your own application should inherit from spring-boot-starter-parent -->
@@ -17,17 +19,16 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<junit.jupiter.version>5.0.0-M5</junit.jupiter.version>
-		<junit.platform.version>1.0.0-M5</junit.platform.version>
+		<junit.jupiter.version>5.0.0-M6</junit.jupiter.version>
+		<junit.platform.version>1.0.0-M6</junit.platform.version>
 	</properties>
 
 	<dependencies>
-		<!-- Compile -->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
-		<!-- Test -->
+
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>

spring-boot-samples/spring-boot-sample-junit-jupiter/src/main/java/sample/SampleJunitJupiterApplication.java

@@ -25,4 +25,5 @@ public class SampleJunitJupiterApplication {
 	public static void main(String[] args) {
 		SpringApplication.run(SampleJunitJupiterApplication.class, args);
 	}
+
 }