update subpic configuration file

cfg/partitioning/subpicture_4_slice_2_tiles_4_subpic.cfg

@@ -3,13 +3,13 @@
 #----------
 #|    |   |
 #|    |   |
-#|    |---|
+#|----|---|
 #|    |   |
 #|    |   |
 #----------
 #     |
 #     v
-# vertically divided into 2 tile, the second tile include two subpicture/slices
+# vertically divided into 2 tile, each tile includes two subpictures/slices
 
 SubPicInfoPresentFlag                  	: 1             # subpicture information present flag(0: OFF, 1: ON)
 NumSubPics                              : 4             # number of subpictures in a picture