Enhance support matrix document

Auto disk config is only enabled by 'auto_disk_config'
in instance metadata and image metadata, only xen seems
implemneted this feature.

So update doc to indicate basic operation and remove
hyper-v from support list.

Change-Id: I447e96b59bc77be7c0bb66e1b3657a1d92741a5c

doc/source/user/support-matrix.ini

@@ -719,11 +719,12 @@ driver-impl-libvirt-vz-vm=complete
 driver-impl-libvirt-vz-ct=complete
 driver-impl-powervm=missing
 
-[guest.disk.autoconfigure.wtf.com]
+[guest.disk.autoconfig]
 title=Auto configure disk
 status=optional
-notes=something something, dark side, something something.
-  Unclear just what this is about.
+notes=Partition and resize FS to match the size specified by
+  flavors.root_gb, As this is hypervisor specific feature.
+  Therefore this operation is considered optional to support.
 cli=
 driver-impl-xenserver=complete
 driver-impl-libvirt-kvm-x86=missing
@@ -733,7 +734,7 @@ driver-impl-libvirt-qemu-x86=missing
 driver-impl-libvirt-lxc=missing
 driver-impl-libvirt-xen=missing
 driver-impl-vmware=missing
-driver-impl-hyperv=complete
+driver-impl-hyperv=missing
 driver-impl-ironic=missing
 driver-impl-libvirt-vz-vm=missing
 driver-impl-libvirt-vz-ct=missing