fix(utils.py): make docstring with latex raw

src/eztao/ts/utils.py

@@ -82,10 +82,10 @@ def add_season(t, lc_start=0, season_start=90, season_end=270):
 
 
 def median_clip(y, num_sigma=3):
- """Clip time series using a three point median filter.
+ r"""Clip time series using a three point median filter.
 
  The sigma (standard deviation) for the time series is computed from the median absolute deviation (MAD) as to reduce the effects from extreme outliers, where
- sigma \sim 1.4826*MAD. If more than 10% of the data points are removed, the upper
+ sigma :math:`\sim` 1.4826*MAD. If more than 10% of the data points are removed, the upper
  bound will be lifted gradually until that fraction drops bellow 10%.
 
  Args: