upated comments about how tile drawing worked and

the tile funtion.  Need to update square and ranges.

tile_grid.py

@@ -10,7 +10,10 @@ from tile import fly
 def draw_tile_grid(width, height, tile_size, tile_function):
     """Draws a (width x height) grid, with tile_function drawn on each tile.
 
-    (Your explanation here.)
+    The code is making it go so many spaces that you put for the with-y 
+    and then it runs the code making it once then jumps to the next 
+    spot and does it again. Then runs the height and then the width again 
+    until its done.
     """
     for y in range(height):
         for x in range(width):