Change description of user namespaces to talk about containers in general

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 </div>
 
 <div class="slide">
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-  <h1>User namespaces [3.7]</h1>
+  <h1>More support for containers</h1>

   <ul class="incremental">
     <li>
   <ul class="incremental">
     <li>

-      One of the last missing pieces for OpenVZ-like containers
+      Containers are lightweight VMs - run on the same kernel as host,
+      but with limited privileges and resources

     </li>
     <li>
     </li>
     <li>

-      Each user namespace has its own <tt>root</tt> user with
-      privileges over the users and processes in that namespace - but
-      not the whole system
+      Previously done by OpenVZ and Linux-VServer; gradually being
+      reimplemented upstream
+    </li>
+    <li>
+      User namespaces (added in 3.7) support the existence of a
+      <tt>root</tt> user inside the container that is unprivileged
+      outside the container

     </li>
     <li>
       Currently somewhat experimental, and requires filesystem
       changes which haven't been done for XFS
     </li>
     <li>
     </li>
     <li>
       Currently somewhat experimental, and requires filesystem
       changes which haven't been done for XFS
     </li>
     <li>

-      Make it work: send patches to upstream XFS developers (this
-      one's hard)
+      Make user namespaces work: send patches to upstream XFS
+      developers (this one's hard)

     </li>
   </ul>
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     </li>
   </ul>
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