Fixed misunderstanding in gain units

suncet_instrument_simulator/config_files/config_default.ini

@@ -63,7 +63,7 @@ num_pixels_to_bin = [2, 2]
 readout_bits = 16
 # [ºC] note: target temperature is -10 ºC; desirement is to keep it below 0; used to calculate dark current
 detector_temperature = -10
-# [e-/DN]
+# [DN/e-]
 detector_gain = 1.8
 # [% as fraction] the fraction of detector pixels to set to dead
 fraction_dead_pixels = 0.000156