Fixed a mistake I made in the how to build section.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353097 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/howtobuild.xml

@@ -61,6 +61,7 @@
                 need to it's possible to manually put the jars in the
                 correct directories.  These can be obtained from here:
             </p>
+            <table>
                 <tr>
                     <th>JAR</th>
                     <th>Location</th>
@@ -89,6 +90,7 @@
                     <td>/junit/jars/junit-3.8.1.jar</td>
                     <td>lib</td>
                 </tr>
+            </table>
             <p>
                 The main targets of interest to our users are:
             </p>