Fix non-clickable MPL links in about:. Bug 296516, r+sr=neil@parkwaycc.co.uk, a=asa

xpfe/global/resources/content/about.xhtml

@@ -102,9 +102,9 @@ h1 {
 
 <ul>
 <li>Copyright &copy; 1998&ndash;2005 by <a href="about:credits">Contributors</a> to 
-the Mozilla codebase under the <a href="chrome://global/content/MPL-1.1.html">
-Mozilla Public License</a> and <a href="chrome://global/content/NPL-1.1.html">
-Netscape Public License</a>.  All Rights Reserved.</li>
+the Mozilla codebase under the <a href="about:license">Mozilla Public License
+and Netscape Public License</a>.  All Rights Reserved.</li>
+
 <li>Portions of this software are copyright &copy; 1994 The Regents of the 
 University of California.  All Rights Reserved.</li>
 <li>Portions of this software are copyright &copy; 2000&ndash;2002 Japan Network Information