Fix broken link in documentation (#1698)

The closing </a> was misplaced.

Author: hugovk

templates/python/documentation.html

@@ -85,7 +85,7 @@ <h2 class="widget-title"><span aria-hidden="true" class="icon-versions"></span>P
                           <li>
                             <a href="https://docs.python.org/3/howto/pyporting.html">Porting Python 2 Code to Python 3</a>
                             <ul>
-                              <li><a href="https://pypi.org/project/caniusepython3/"></a>Determine what projects are blocking you from porting to Python 3</li>
+                              <li><a href="https://pypi.org/project/caniusepython3/">Determine what projects are blocking you from porting to Python 3</a></li>
                               <li><a href="https://wiki.python.org/moin/PythonConsulting/Python%202%20support%20and%20migration">Python 2 Support and Migration</a></li>
                             </ul>
                           </li>