fio howto typo fixes

Fix a few typos in the fio HOWTO file.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 26a9b93..9bfa437 100644
--- a/HOWTO
+++ b/HOWTO
@@ -230,7 +230,7 @@
 		dump this text description when this job is run. It's
 		not parsed.
 
-directory=str	Prefix filenames with this directory. Used to places files
+directory=str	Prefix filenames with this directory. Used to place files
 		in a different location than "./".
 
 filename=str	Fio normally makes up a filename based on the job name,
@@ -250,7 +250,7 @@
 opendir=str	Tell fio to recursively add any file it can find in this
 		directory and down the file system tree.
 
-lockfile=str	Fio defaults to not doing any locking files before it does
+lockfile=str	Fio defaults to not locking any files before it does
 		IO to them. If a file or file descriptor is shared, fio
 		can serialize IO to that file to make the end result
 		consistent. This is usual for emulating real workloads that
@@ -303,7 +303,7 @@
 size=int	The total size of file io for this job. Fio will run until
 		this many bytes has been transferred, unless runtime is
 		limited by other options (such as 'runtime', for instance).
-		Unless specific nr_files and filesize options are given,
+		Unless specific nrfiles and filesize options are given,
 		fio will divide this size between the available files
 		specified by the job.