docs: fix missing / in xml examples

* docs/formatdomain.html.in: Fix typos in examples.

docs/formatdomain.html.in

@@ -947,7 +947,7 @@
   <devices>
     <disk type='file' snapshot='external'>
       <driver name="tap" type="aio" cache="default"/>
-      <source file='/var/lib/xen/images/fv0'/ startupPolicy='optional'>
+      <source file='/var/lib/xen/images/fv0'/ startupPolicy='optional'/>
       <target dev='hda' bus='ide'/>
       <iotune>
         <total_bytes_sec>10000000</total_bytes_sec>
@@ -2980,7 +2980,7 @@ qemu-kvm -net nic,model=? /dev/null
   ...
   <devices>
     <console type='stdio'>
-      <target port='1'>
+      <target port='1'/>
     </console>
   </devices>
   ...</pre>