docs: drvnodedev: Fix a few closing XML elements in the examples

Signed-off-by: NErik Skultety <eskultet@redhat.com>

docs/drvnodedev.html.in

@@ -184,7 +184,7 @@
     <address domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
   </capability>
 ...
-&lt;device&gt;</pre>
+&lt;/device&gt;</pre>
 
     <h3><a id="MDEVCap">MDEV capability</a></h3>
     <p>
@@ -300,8 +300,8 @@
   &lt;capability type='mdev'&gt;
     &lt;type id='nvidia-11'/&gt;
     &lt;iommuGroup number='12'/&gt;
-  &lt;capability/&gt;
-&lt;device/&gt;</pre>
+  &lt;/capability&gt;
+&lt;/device&gt;</pre>
 
     <p>
       The support of mediated device's framework in libvirt's node device driver