Update style for examples (black)

Author: rsbohn

digitalio/digitalio_blink_example.py

@@ -12,4 +12,4 @@
 
 while True:
     led.value = not led.value
-    time.sleep(0.25)
+    time.sleep(0.25)

displayio/displayio_colored_screen.py

@@ -9,7 +9,7 @@
 # Create a two color palette
 palette = displayio.Palette(2)
 
-palette[0] = 0xbb33bb  # screen color
+palette[0] = 0xBB33BB  # screen color
 
 # Create a TileGrid using the Bitmap and Palette
 tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)
@@ -25,4 +25,4 @@
 
 # Loop forever so you can enjoy your image
 while True:
-    pass
+    pass

displayio/displayio_shape_corners.py

@@ -1,5 +1,6 @@
 import board
 import displayio
+
 """
 Illustrate usage of displayio.Shape with boundary and mirror.
 """
@@ -15,7 +16,7 @@
 
 # set corner pixels out of bounds
 for i in range(CORNER_SIZE):
-    shape.set_boundary(i, CORNER_SIZE-1-i, SHAPE_WIDTH//2-1)
+    shape.set_boundary(i, CORNER_SIZE - 1 - i, SHAPE_WIDTH // 2 - 1)
 
 palette[0] = 0x0000FF  # out of bounds color
 palette[1] = 0x00FFFF  # shape color