explain what this page is about.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@9916 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/hudson/PluginManager/index.jelly

@@ -7,5 +7,9 @@
       
 -->
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
-  <local:table page="updates" list="${app.updateCenter.updates}" xmlns:local="/hudson/PluginManager" />
+  <local:table page="updates" list="${app.updateCenter.updates}" xmlns:local="/hudson/PluginManager">
+    <div style="margin-top:1em">
+      This page lists updates to the plugins you currently use.
+    </div>
+  </local:table>
 </j:jelly>
\ No newline at end of file

core/src/main/resources/hudson/PluginManager/table.jelly

@@ -39,11 +39,13 @@
             </j:otherwise>
           </j:choose>
         </table>
+        
         <j:if test="${!empty(list)}">
-          <div align="right" style="margin-top:1em">
+          <div style="float:right; margin-top:1em">
             <f:submit value="Install" />
           </div>
         </j:if>
+        <d:invokeBody />
       </local:tabBar>
     </l:main-panel>
   </l:layout>