message: Fix the description of ROI
diff: @@ -8,7 +8,7 @@ Learn to:
  - Access pixel values and modify them
  - Access image properties
  -- Setting Region of Image (ROI)
  +- Setting Region of Interest (ROI)
  - Splitting and Merging images
  Almost all the operations in this section is mainly related to Numpy rather than OpenCV. A good
  