libvirt.h.in: fix documentation for virConnectDomainEventBlockJobCallback

In commit 3ac26e26 parameter "path" was
renamed to "disk" but this change was not reflected in the documentation.

Additionally, documentation of the "opaque" parameter was missing.

include/libvirt/libvirt.h.in

@@ -4359,9 +4359,10 @@ typedef enum {
  * virConnectDomainEventBlockJobCallback:
  * @conn: connection object
  * @dom: domain on which the event occurred
- * @path: fully-qualified filename of the affected disk
+ * @disk: fully-qualified filename of the affected disk
  * @type: type of block job (virDomainBlockJobType)
  * @status: final status of the operation (virConnectDomainEventBlockJobStatus)
+ * @opaque: application specified data
  *
  * The callback signature to use when registering for an event of type
  * VIR_DOMAIN_EVENT_ID_BLOCK_JOB with virConnectDomainEventRegisterAny()