Remove typo in computation of 1D vel disp: select xx,yy,zz components instead of xx and yy

Author: EvgeniiChaikin

velociraptor/catalogue/soap_catalogue.py

@@ -325,7 +325,7 @@ def compute_value(
 
         Returns the 1D velocity dispersion as a unyt.unyt_array.
         """
-        return np.sqrt(velocity_dispersion_matrix[:, 0:2].sum(axis=1))
+        return np.sqrt(velocity_dispersion_matrix[:, 0:3].sum(axis=1))
 
 
 class CatalogueGroup(CatalogueElement):