'V' is a running state, not an idle state. Correct HOWTO.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 15f576d..f4f596a 100644
--- a/HOWTO
+++ b/HOWTO
@@ -935,7 +935,7 @@
 	M	Running, doing mixed sequential reads/writes.
 	m	Running, doing mixed random reads/writes.
 	F	Running, currently waiting for fsync()
-V		Running, doing verification of written data.
+	V	Running, doing verification of written data.
 E		Thread exited, not reaped by main thread yet.
 _		Thread reaped.