docs: update QEMU driver docs to replace deprecated with deleted

Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

docs/drvqemu.html.in

@@ -427,7 +427,7 @@ mount -t cgroup none /dev/cgroup -o devices
     <h3><a id="xmlimport">Converting from QEMU args to domain XML</a></h3>
 
     <p>
-      <b>Note:</b> this operation is <span class="deprecated"> deprecated as of
+      <b>Note:</b> this operation is <span class="removed"> deleted as of
         5.5.0</span> and will return an error.
     </p>
     <p>

docs/libvirt.css

@@ -274,7 +274,7 @@ span.since {
     font-weight: bold;
 }
 
-span.deprecated {
+span.removed {
     color: darkred;
     font-style: italic;
     font-weight: bold;