Update license year

(cherry picked from commit 862b7ae)

Author: kazuki43zoo

src/site/zh/xdoc/sample.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2010-2016 the original author or authors.
+       Copyright 2010-2017 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.