added newer link on contributions

#1468

Author: grobmeier

src/site/xdoc/manual/index.xml

@@ -139,7 +139,7 @@
             <li><b>Community:</b> It is an Apache Software Foundation project following the community and support
               model used by all ASF projects. If you want to contribute or gain the right to
               commit changes just follow the path outlined at
-              <a href="https://jakarta.apache.org/site/contributing.html">Contributing</a>.</li>
+              <a href="https://community.apache.org/contributors/">Contributing</a>.</li>
           </ol>
         </subsection>
       </section>