raid: md_p.h: drop duplicated word in a comment

Drop the doubled word "the" in a comment.
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: linux-raid@vger.kernel.org
Signed-off-by: NSong Liu <songliubraving@fb.com>

include/uapi/linux/raid/md_p.h

@@ -123,7 +123,7 @@ typedef struct mdp_device_descriptor_s {
 
 /*
  * Notes:
- * - if an array is being reshaped (restriped) in order to change the
+ * - if an array is being reshaped (restriped) in order to change
  *   the number of active devices in the array, 'raid_disks' will be
  *   the larger of the old and new numbers.  'delta_disks' will
  *   be the "new - old".  So if +ve, raid_disks is the new value, and