message: AudioCalcLevel_F32.h: improve comments
diff: #include "Arduino.h"
  #include "AudioFilterTimeWeighting_F32.h"
  -//Time weighting for sound level meter. Defaults to SLOW
  +//Exponential time weighting for sound level meter. Defaults to SLOW
  class AudioCalcLevel_F32 : public AudioFilterTimeWeighting_F32
  {
  public:
  