fix typo in background_color example

Author: FoamyGuy

examples/display_text_background_color.py

@@ -7,7 +7,7 @@
 
 
 text = " Color Background Hello world"
-text_area = label.Label(terminalio.FONT, text=text, color=0x0000FF, backgroud_color=0xFFAA00)
+text_area = label.Label(terminalio.FONT, text=text, color=0x0000FF, background_color=0xFFAA00)
 text_area.x = 10
 text_area.y = 10
 board.DISPLAY.show(text_area)