added XML Schema reference to site.xml

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@814158 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/site/site.xml b/src/site/site.xml
index 036282a..276b130 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -19,7 +19,7 @@
 under the License.
 -->
 
-<project>
+<project xmlns="http://maven.apache.org/DECORATION/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/DECORATION/1.0.0 http://maven.apache.org/xsd/decoration-1.0.0.xsd">
   <body>
     <menu name="Overview">
       <item name="Introduction" href="index.html" />