Documentation update

[briodan]

noticed a typo in the sample code

current code:

filters:
      # The values after multiplied by 1000000 are 0, 20, 100, 320
      # and correspond to LED being off, low, med, high intensity.
      # The "pulse_width" sensor sometimes reads non-0 (e.g 221) when
      # the LED is off which is why 0 (off state) is returned in the
      default case.
      - multiply: 1000000

corrected code

filters:
      # The values after multiplied by 1000000 are 0, 20, 100, 320
      # and correspond to LED being off, low, med, high intensity.
      # The "pulse_width" sensor sometimes reads non-0 (e.g 221) when
      # the LED is off which is why 0 (off state) is returned in the
      # default case.
      - multiply: 1000000