lguest: comment documentation update.

Took some cycles to re-read the Lguest Journey end-to-end, fix some
rot and tighten some phrases.

Only comments change.  No new jokes, but a couple of recycled old jokes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/linux/lguest_launcher.h b/include/linux/lguest_launcher.h
index 589be3e..e7217dc 100644
--- a/include/linux/lguest_launcher.h
+++ b/include/linux/lguest_launcher.h
@@ -16,6 +16,10 @@
  * a new device, we simply need to write a new virtio driver and create support
  * for it in the Launcher: this code won't need to change.
  *
+ * Virtio devices are also used by kvm, so we can simply reuse their optimized
+ * device drivers.  And one day when everyone uses virtio, my plan will be
+ * complete.  Bwahahahah!
+ *
  * Devices are described by a simplified ID, a status byte, and some "config"
  * bytes which describe this device's configuration.  This is placed by the
  * Launcher just above the top of physical memory:
@@ -26,7 +30,7 @@
 	/* The number of virtqueues (first in config array) */
 	__u8 num_vq;
 	/* The number of bytes of feature bits.  Multiply by 2: one for host
-	 * features and one for guest acknowledgements. */
+	 * features and one for Guest acknowledgements. */
 	__u8 feature_len;
 	/* The number of bytes of the config array after virtqueues. */
 	__u8 config_len;