include: nodedev: Fix a misleading comment about the used callback

Actually we use virConnectNodeDeviceEventGenericCallback.
Signed-off-by: NChen Hanxiao <chenhanxiao@gmail.com>
Signed-off-by: NErik Skultety <eskultet@redhat.com>

include/libvirt/libvirt-nodedev.h

@@ -142,7 +142,7 @@ int                     virNodeDeviceDestroy    (virNodeDevicePtr dev);
  */
 typedef enum {
     VIR_NODE_DEVICE_EVENT_ID_LIFECYCLE = 0, /* virConnectNodeDeviceEventLifecycleCallback */
-    VIR_NODE_DEVICE_EVENT_ID_UPDATE = 1, /* virConnectNodeDeviceEventUpdateCallback */
+    VIR_NODE_DEVICE_EVENT_ID_UPDATE = 1, /* virConnectNodeDeviceEventGenericCallback */
 
 # ifdef VIR_ENUM_SENTINELS
     VIR_NODE_DEVICE_EVENT_ID_LAST