message: Fix the example in py_calib3d/py_calibration
diff: @@ -127,7 +127,7 @@ for fname in images:
  objpoints.append(objp)
  corners2 = cv.cornerSubPix(gray,corners, (11,11), (-1,-1), criteria)
  - imgpoints.append(corners)
  + imgpoints.append(corners2)
  # Draw and display the corners
  cv.drawChessboardCorners(img, (7,6), corners2, ret)
  