Update web.xml to Servlet 2.4 format.

PR: Bugzilla #32323
Submitted By:  Duncan Mills <duncan.mills AT oracle.com>


git-svn-id: https://svn.apache.org/repos/asf/struts/sandbox/trunk@105907 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/struts-shale-mailreader/src/web/WEB-INF/web.xml b/struts-shale-mailreader/src/web/WEB-INF/web.xml
index 0c3795b..24f6d55 100644
--- a/struts-shale-mailreader/src/web/WEB-INF/web.xml
+++ b/struts-shale-mailreader/src/web/WEB-INF/web.xml
@@ -1,10 +1,5 @@
 <?xml version="1.0" encoding="ISO-8859-1"?>
 
-<!DOCTYPE web-app
-  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
-  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
-
-
 <!--
 
  Copyright 2002,2004 The Apache Software Foundation.
@@ -24,7 +19,11 @@
 -->
 
 
-<web-app>
+<web-app      xmlns="http://java.sun.com/xml/ns/j2ee"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
+                     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
+            version="2.4">
 
   <display-name>Struts-Shale MailReader Example</display-name>