Spaces to tabs and license cleanup

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

@@ -1,6 +1,23 @@
+/*
+ * Copyright 2002-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package sample.config;
 
 import org.springframework.session.data.redis.config.annotation.web.http.*;
 
+// tag::class[]
 @EnableRedisHttpSession // <1>
 public class HttpSessionConfig { }
+// end::class[]