HOWTO: typo: write_log_log -> write_lat_log + use suffix

- I guess 'write_log_log' was a copy-pasta typo.

- You used 'suffix' everywhere except for two places where you said
  'postfix'.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/HOWTO b/HOWTO
index 73e8265..92ce05d 100644
--- a/HOWTO
+++ b/HOWTO
@@ -320,7 +320,7 @@
 		one by appending a ':<nr>' to the end of the string given.
 		For a random read, it would look like 'rw=randread:8' for
 		passing in an offset modifier with a value of 8. If the
-		postfix is used with a sequential IO pattern, then the value
+		suffix is used with a sequential IO pattern, then the value
 		specified will be added to the generated offset for each IO.
 		For instance, using rw=write:4k will skip 4k for every
 		write. It turns sequential IO into sequential IO with holes.
@@ -1107,8 +1107,8 @@
 		file. Can be used to store data of the bandwidth of the
 		jobs in their lifetime. The included fio_generate_plots
 		script uses gnuplot to turn these text files into nice
-		graphs. See write_log_log for behaviour of given
-		filename. For this option, the postfix is _bw.log.
+		graphs. See write_lat_log for behaviour of given
+		filename. For this option, the suffix is _bw.log.
 
 write_lat_log=str Same as write_bw_log, except that this option stores io
 		submission, completion, and total latencies instead. If no