Updated OnDiskBitmap RTD example for 5.x

Author: makermelissa

shared-bindings/displayio/OnDiskBitmap.c

@@ -62,7 +62,7 @@
 //|       face = displayio.TileGrid(odb, pixel_shader=displayio.ColorConverter())
 //|       splash.append(face)
 //|       # Wait for the image to load.
-//|       board.DISPLAY.wait_for_frame()
+//|       board.DISPLAY.refresh(target_frames_per_second=60)
 //|
 //|       # Fade up the backlight
 //|       for i in range(100):