Fix html.

Documentation.html

@@ -2045,9 +2045,11 @@ setfacl -d -m "g:www-data:rwx" tmp
     <dt id="cfg_Export">$cfg['Export']['method'] string</dt>
     <dd>
         Defines how the export form is displayed when it loads. Valid values are:
+        <ul>
         <li><tt>quick</tt> to display the minimum number of options to configure</li>
         <li><tt>custom</tt> to display every available option to configure</li>
         <li><tt>custom-no-form</tt> same as <tt>custom</tt> but does not display the option of using quick export</li>
+        </ul>
     </dd>
 
     <dt id="cfg_Import">$cfg['Import'] array</dt>