Fixed some invalid xhtml.

mailinglist.xml

@@ -14,7 +14,7 @@
 <p>
 Comedi has a mailing list for announcements, questions, and discussion
 about Comedi and data acquisition using Linux:
-
+</p>
 <table border="0" style="background-color: #fff; padding: 5px;" cellspacing="0">
   <tr><td>
   <img src="http://groups.google.com/groups/img/3nb/groups_bar.gif"
@@ -23,19 +23,17 @@ about Comedi and data acquisition using Linux:
   <tr><td style="padding-left: 5px">
   <b>Subscribe to Comedi mailing list</b>
   </td></tr>
-  <form action="http://groups.google.com/group/comedi_list/boxsubscribe">
   <tr><td style="padding-left: 5px;">
+  <form action="http://groups.google.com/group/comedi_list/boxsubscribe">
   Email: <input type="text" name="email"/>
   <input type="submit" name="sub" value="Subscribe"/>
+  </form>
   </td></tr>
-</form>
 <tr><td align="right">
   <a href="http://groups.google.com/group/comedi_list">Visit this group</a>
 </td></tr>
 </table>
 
-</p>
-
 <p>
 <a href="https://mail.comedi.org/pipermail/comedi/">Old mailing list archive</a>
 </p>