[libvirt] Minor doc fix for <clock>

[Cole Robinson]

FYI, I just pushed this minor docs fix:

commit 45bd290b64c9f911ebb6e0990f8fcef249576436
Author: Cole Robinson <crobinso at redhat.com>
Date:   Wed Nov 4 13:26:28 2009 -0500

    docs: <clock> property is 'offset', not 'sync'

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 53cd960..d26ce75 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -300,7 +300,7 @@

     <dl>
       <dt><code>clock</code></dt>
-      <dd>The <code>sync</code> attribute takes either "utc" or
+      <dd>The <code>offset</code> attribute takes either "utc" or
        "localtime" to specify how the guest clock is initialized
        in relation to the host OS.
       </dd>

Thanks,
Cole