docs: formatdomain: move 'msrs' out of Hyper-V Enlightenments

Introduced by: commit e9528f41

'msrs' is a feature unrelated to Hyper-V Enlightenments, the commit message
which added it and the test have it right:

    <features>
      ...
      <msrs unknown='ignore'>
      ...
    </features>
Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>

docs/formatdomain.html.in

@@ -2041,7 +2041,6 @@
     <tlbflush state='on'/>
     <ipi state='on'/>
     <evmcs state='on'/>
-    <msrs unknown='ignore'/>
   </hyperv>
   <kvm>
     <hidden state='on'/>
@@ -2057,6 +2056,7 @@
     <tseg unit='MiB'>48</tseg>
   </smm>
   <htm state='on'/>
+  <msrs unknown='ignore'/>
 </features>
 ...</pre>