drvesx.html.in: Kill useless spaces in <pre/>

The <pre/> section is rendered as-is on the page. That is, if all
the lines are prefixed with 4 spaces the rendered page will also
have them. Problem is if we put a box around such <pre/> because
the content might not fix into it.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

docs/drvesx.html.in

@@ -467,14 +467,14 @@ ethernet0.checkMACAddress = "false"
         Here a domain XML snippet:
     </p>
 <pre>
-    ...
-    &lt;disk type='file' device='disk'&gt;
+...
+&lt;disk type='file' device='disk'&gt;
   &lt;source file='[local-storage] Fedora11/Fedora11.vmdk'/&gt;
   &lt;target dev='sda' bus='scsi'/&gt;
   &lt;address type='drive' controller='0' bus='0' unit='0'/&gt;
-    &lt;/disk&gt;
-    &lt;controller type='scsi' index='0' model='<strong>lsilogic</strong>'/&gt;
-    ...
+&lt;/disk&gt;
+&lt;controller type='scsi' index='0' model='<strong>lsilogic</strong>'/&gt;
+...
 </pre>
     <p>
         The controller element is supported <span class="since">since 0.8.2</span>.
@@ -482,13 +482,13 @@ ethernet0.checkMACAddress = "false"
         specify the SCSI controller model. This attribute usage is deprecated now.
     </p>
 <pre>
-    ...
-    &lt;disk type='file' device='disk'&gt;
+...
+&lt;disk type='file' device='disk'&gt;
   &lt;driver name='<strong>lsilogic</strong>'/&gt;
   &lt;source file='[local-storage] Fedora11/Fedora11.vmdk'/&gt;
   &lt;target dev='sda' bus='scsi'/&gt;
-    &lt;/disk&gt;
-    ...
+&lt;/disk&gt;
+...
 </pre>
 
 
@@ -513,13 +513,13 @@ ethernet0.checkMACAddress = "false"
         Here a domain XML snippet:
     </p>
 <pre>
-    ...
-    &lt;interface type='bridge'&gt;
+...
+&lt;interface type='bridge'&gt;
   &lt;mac address='00:50:56:25:48:c7'/&gt;
   &lt;source bridge='VM Network'/&gt;
   &lt;model type='<strong>e1000</strong>'/&gt;
-    &lt;/interface&gt;
-    ...
+&lt;/interface&gt;
+...
 </pre>