update docstring

btk/deblend.py

@@ -203,7 +203,7 @@ def __init__(
         Args:
             max_n_sources: See parent class.
             sky_level: Background intensity in images to be detected (assumed constant).
-            threshold_scale: Minimum intensity of peaks. TODO: update
+            threshold_scale: Minimum number of sigmas above noise level for detections.
             min_distance: Minimum distance in pixels between two peaks.
             use_mean: Flag to use the band average for deblending.
             use_band: Integer index of the band to use for deblending