news: Update the qemu version that dedicated performance hint is from

KVM dedicated performance hint is added since qemu version 2.10.0 not
2.10.1.
Signed-off-by: NHan Han <hhan@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>

docs/news.xml

@@ -469,7 +469,7 @@
           With <code>&lt;hint-dedicated state='on'/&gt;</code> and
           <code>&lt;cpu mode='host-passthrough'/&gt;</code>, it
           allows a guest to enable optimizations when running on dedicated
-          vCPUs. QEMU newer than 2.12.1 and kernel newer than 4.17
+          vCPUs. QEMU newer than 2.12.0 and kernel newer than 4.17
           are required.
         </description>
       </change>