ring_buffer: fix comments

Impact: comments cleanup

fix incorrect comments for enum ring_buffer_type
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/ring_buffer.h

@@ -29,16 +29,18 @@ struct ring_buffer_event {
  *
  * @RINGBUF_TYPE_TIME_STAMP:	Sync time stamp with external clock
  *				 array[0]    = tv_nsec
- *				 array[1] = tv_sec
+ *				 array[1..2] = tv_sec
  *				 size = 16 bytes
  *
  * @RINGBUF_TYPE_DATA:		Data record
  *				 If len is zero:
  *				  array[0] holds the actual length
- *				  array[1..(length+3)/4-1] holds data
+ *				  array[1..(length+3)/4] holds data
+ *				  size = 4 + 4 + length (bytes)
  *				 else
  *				  length = len << 2
- *				  array[0..(length+3)/4] holds data
+ *				  array[0..(length+3)/4-1] holds data
+ *				  size = 4 + length (bytes)
  */
 enum ring_buffer_type {
 	RINGBUF_TYPE_PADDING,