XEP-0005: Fix minor DTD issues

xep-0005.xml

@@ -13,6 +13,12 @@
   <status>Obsolete</status>
   <type>Informational</type>
   <sig>None</sig>
+  <dependencies>
+    <spec>XMPP Core</spec>
+  </dependencies>
+  <supersedes/>
+  <supersededby/>
+  <shortname>N/A</shortname>
   <author>
     <firstname>Jeremie</firstname>
     <surname>Miller</surname>