Man page typo on zero_buffers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.1 b/fio.1
index dd8eda9..04dcb73 100644
--- a/fio.1
+++ b/fio.1
@@ -199,6 +199,7 @@
 for using direct IO, though it usually depends on the hardware block size.
 This option is mutually exclusive with using a random map for files, so it
 will turn off that option.
+.TP
 .B zero_buffers
 Initialise buffers with all zeros. Default: fill buffers with random data.
 .TP