message: Update output_handler.cc
  fix incorrectly documented led-color order
diff: @@ -22,7 +22,7 @@ This function uses the device's LEDs to visually indicate the current y value.
  The y value is in the range -1 <= y <= 1. The LEDs (red, green, blue,
  and yellow) are physically lined up in the following order:
  - [ R G B Y ]
  + [ R B G Y ]
  The following table represents how we will light the LEDs for different values:
  