Docs added

docs/debugging.md

@@ -3,7 +3,7 @@ Debug will output most of the useful state to the console. This can be enable in
 by setting this in your keymap. NOTE that it will be slower, so only enable this when you
 need debugging.
 ```python
-DEBUG_ENABLE = True
+keyboard.debug_enabled = True
 ```
 
 The output can be viewed by connecting to the serial port of the keybord. Please refer to [THIS](https://learn.adafruit.com/welcome-to-circuitpython/kattni-connecting-to-the-serial-console) for