add missing close tag in about.html file

change copyright to 2018
remove obsolete align attribute on table

Change-Id: If86baf9f57d034606cb74bc7ad4350d6c066136e
diff --git a/distro-source/core/src/about.html b/distro-source/core/src/about.html
index 92f0ca9..9abcc30 100644
--- a/distro-source/core/src/about.html
+++ b/distro-source/core/src/about.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <html>
 
    <head>
@@ -38,7 +39,7 @@
    </head>
 
    <body>
-      <table align="center">
+      <table style="margin: 0 auto;">
          <tr>
             <td id="title"><a href="http://code.google.com/webtoolkit/">Google Web Toolkit</a></td>
          </tr>
@@ -50,7 +51,7 @@
       <hr/>
 
       <div id="intro">
-         Copyright &copy; 2009 <a href="http://www.google.com/">Google Inc.</a>
+         Copyright &copy; 2018 <a href="http://www.google.com/">Google Inc.</a>
          All rights reserved.  
          All other product, service names, brands, or trademarks, are the property of their respective owners.
       </div>
@@ -63,14 +64,14 @@
                 <ul>
                     <li><a href="http://tomcat.apache.org/">Tomcat</a> (with modifications)</li>
                     <li><a href="http://tapestry.apache.org/">Tapestry</a></li>
-                </ul
+                </ul>
             </li>
             <li>
                 The <a href="http://www.eclipse.org/">Eclipse Foundation</a>
                 <ul>
                     <li><a href="http://www.eclipse.org/jdt/">Java Development Tools</a></li>
                     <li><a href="http://www.eclipse.org/swt/">Standard Widget Toolkit</a> (with modifications)</li>
-                </ul
+                </ul>
             </li>
             <li>The <a href="http://www.mortbay.com/">Mort Bay Consulting</a>
               <ul>
@@ -82,7 +83,7 @@
                 <ul>
                     <li><a href="http://www.mozilla.org/releases/mozilla1.7.12/">Mozilla 1.7.12</a></li>
                     <li><a href="http://www.mozilla.org/rhino/">Rhino</a> (with modifications)</li>
-                </ul
+                </ul>
             </li>
             <li>The <a href="http://www.objectweb.org/">ObjectWeb</a>
               <ul>