Additional Checkstyle Fixes

Issue gh-393

samples/boot/src/main/java/sample/config/HttpSessionConfig.java

@@ -18,8 +18,8 @@ package sample.config;
 
 import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
 
-
 // tag::class[]
 @EnableRedisHttpSession // <1>
-public class HttpSessionConfig { }
+public class HttpSessionConfig {
+}
 // end::class[]