Staging: iio: fix typo in userspace example codes and document

Signed-off-by: Barry Song <21cnbao@gmail.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/Documentation/lis3l02dqbuffersimple.c

@@ -19,7 +19,7 @@
 #include <sys/dir.h>
 
 #include <linux/types.h>
-#include "iio_util.h"
+#include "iio_utils.h"
 
 static const char *ring_access = "/dev/iio/lis3l02dq_ring_access";
 static const char *ring_event = "/dev/iio/lis3l02dq_ring_event";

drivers/staging/iio/Documentation/userspace.txt

@@ -56,5 +56,5 @@ KERNEL="ring_event_line*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_
 KERNEL="event_line*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_event"
 KERNEL="ring_access*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_ring_access"
 
-The files, lis3l02dqbuffersimple.c and iio_util.h in this directory provide an example
+The files, lis3l02dqbuffersimple.c and iio_utils.h in this directory provide an example
 of how to use the ring buffer and event interfaces.