update doc

Signed-off-by: kunwuz <[email protected]>

Author: kunwuz

docs/source/search_methods_index/Constraint-based causal discovery methods/CDNOD.rst

@@ -16,7 +16,7 @@ Usage
     from causallearn.search.ConstraintBased.CDNOD import cdnod
 
     # default parameters
-    cg = cdnod(data)
+    cg = cdnod(data, c_indx)
 
     # or customized parameters
     cg = cdnod(data, c_indx, alpha, indep_test, stable, uc_rule, uc_priority, mvcdnod,