Fix typo (#333)

* Fix typo

* Fix typo

---------

Co-authored-by: Romain Hugonnet <romain.hugonnet@gmail.com>

xdem/dem.py

@@ -60,8 +60,7 @@ def __init__(
     ) -> None:
         """
         Load digital elevation model data through the Raster class, parse additional attributes from filename or
-        metadata
-        trougth the SatelliteImage class, and then parse vertical reference from DEM product name.
+        metadata through the SatelliteImage class, and then parse vertical reference from DEM product name.
         For manual input, only one of "vref", "vref_grid" or "ccrs" is necessary to set the vertical reference.
 
         :param filename_or_dataset: The filename of the dataset.