docs: device-mapper: move it to the admin-guide

The DM support describes lots of aspects related to mapped
disk partitions from the userspace PoV.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 7a87a64..8a60a4a 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3558,7 +3558,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
 		 * v1.5.0+:
 		 *
 		 * Sync action:
-		 *   See Documentation/device-mapper/dm-raid.rst for
+		 *   See Documentation/admin-guide/device-mapper/dm-raid.rst for
 		 *   information on each of these states.
 		 */
 		DMEMIT(" %s", sync_action);