update document

xxl-job-executor-samples/xxl-job-executor-sample-springboot/src/main/java/com/xxl/job/executor/core/config/XxlJobConfig.java

  * @author xuxueli 2017-04-28
  */
 @Configuration
-@ComponentScan(basePackages = "com.xxl.job.executor.service.jobhandler")
 public class XxlJobConfig {
     private Logger logger = LoggerFactory.getLogger(XxlJobConfig.class);