docs: Document managedsave-edit commands support

This patch documents support for managedsave-dumpxml,
managedsave-define and managedsave-edit commands.
Signed-off-by: NKothapally Madhu Pavan <kmp@linux.vnet.ibm.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>

docs/news.xml

@@ -35,6 +35,16 @@
 <libvirt>
   <release version="v3.7.0" date="unreleased">
     <section title="New features">
+      <change>
+        <summary>
+          qemu: Add managedsave-edit commands
+        </summary>
+        <description>
+          Using managedsave-dumpxml, managedsave-define and managedsave-edit
+          commands, now we can dump and edit the XML configuration of domain
+          which has managedsave image.
+        </description>
+      </change>
       <change>
         <summary>
           qemu: Add migrate-getmaxdowntime command