Misc. ./samples typos

Found via `codespell -q 3 --skip="./3rdparty" -I ../opencv-whitelist.txt`

samples/cpp/select3dobj.cpp

@@ -1,7 +1,7 @@
 /*
  *
  * select3obj.cpp With a calibration chessboard on a table, mark an object in a 3D box and
- *                track that object in all subseqent frames as long as the camera can see
+ *                track that object in all subsequent frames as long as the camera can see
  *                the chessboard. Also segments the object using the box projection. This
  *                program is useful for collecting large datasets of many views of an object
  *                on a table.
@@ -42,11 +42,11 @@ const char* helphelp =
 "\n"
 "Using a camera's intrinsics (from calibrating a camera -- see calibration.cpp) and an\n"
 "image of the object sitting on a planar surface with a calibration pattern of\n"
-"(board_width x board_height) on the surface, we draw a 3D box aroung the object. From\n"
+"(board_width x board_height) on the surface, we draw a 3D box around the object. From\n"
 "then on, we can move a camera and as long as it sees the chessboard calibration pattern,\n"
-"it will store a mask of where the object is. We get succesive images using <output_prefix>\n"
+"it will store a mask of where the object is. We get successive images using <output_prefix>\n"
 "of the segmentation mask containing the object. This makes creating training sets easy.\n"
-"It is best of the chessboard is odd x even in dimensions to avoid amiguous poses.\n"
+"It is best if the chessboard is odd x even in dimensions to avoid ambiguous poses.\n"
 "\n"
 "The actions one can use while the program is running are:\n"
 "\n"