mkfs.f2fs.8: fix formatting for -l parameter in man page

Signed-off-by: John A. Leuenhagen <john@zlima12.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/man/mkfs.f2fs.8 b/man/mkfs.f2fs.8
index 0aca4dc..8c57216 100644
--- a/man/mkfs.f2fs.8
+++ b/man/mkfs.f2fs.8
@@ -141,6 +141,7 @@
 .TP
 .BI \-i
 Enable extended node bitmap.
+.TP
 .BI \-l " volume-label"
 Specify the volume label to the partition mounted as F2FS.
 .TP