formatnetwork: Remove useless </route>

Almost all XML examples use <tag .../> rather than <tag ...></tag> if
the element is empty. Let's remove the two instances of the latter.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

docs/formatnetwork.html.in

@@ -824,8 +824,7 @@
   <route address="192.168.222.0" prefix="24" gateway="192.168.122.2" />
   <ip family="ipv6" address="2001:db8:ca2:2::1" prefix="64" />
   <route family="ipv6" address="2001:db8:ca2:3::" prefix="64" gateway="2001:db8:ca2:2::2"/>
-  <route family="ipv6" address="2001:db9:4:1::" prefix="64" gateway="2001:db8:ca2:2::3" metric='2'>
-  </route>
+  <route family="ipv6" address="2001:db9:4:1::" prefix="64" gateway="2001:db8:ca2:2::3" metric='2'/>
 ...
     </pre>
 
@@ -1186,8 +1185,7 @@
       &lt;host id="0:4:7e:7d:f0:7d:a8:bc:c5:d2:13:32:11:ed:16:ea:84:63" name="lucas" ip="2001:db8:ca2:2:3::4" /&gt;
     &lt;/dhcp&gt;
   &lt;/ip&gt;
-  &lt;route family="ipv6" address="2001:db8:ca2:8::" prefix="64" gateway="2001:db8:ca2:7::4" &gt;
-  &lt;/route&gt;
+  &lt;route family="ipv6" address="2001:db8:ca2:8::" prefix="64" gateway="2001:db8:ca2:7::4"/&gt;
 &lt;/network&gt;</pre>
 
     <h3><a name="examplesPrivate">Isolated network config</a></h3>