Spelling fixes

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index 2259edf..a4f641a 100644
--- a/init.c
+++ b/init.c
@@ -395,7 +395,7 @@
 		.name	= "thinktime_spin",
 		.type	= FIO_OPT_INT,
 		.off1	= td_var_offset(thinktime_spin),
-		.help	= "Start thinktime by spinning this amount (usec)",
+		.help	= "Start think time by spinning this amount (usec)",
 		.def	= "0",
 	},
 	{