Update polygon.py

Update docs

Author: matemaciek

adafruit_display_shapes/polygon.py

@@ -39,15 +39,15 @@ class Polygon(displayio.TileGrid):
  :param list points: A list of (x, y) tuples of the points
  :param int|None outline: The outline of the polygon. Can be a hex value for a color or
  ``None`` for no outline.
- :param bool close: Wether to connect first and last point.
+ :param bool close: (Optional) Wether to connect first and last point. (True)
  """
 
  def __init__(
  self,
  points: List[Tuple[int, int]],
  *,
  outline: Optional[int] = None,
- close: bool = True,
+ close: Optional[bool] = True,
  ) -> None:
  if close:
  points.append(points[0])