style: fix typo

Author: rememberYou

pyrdf2vec/walkers/walker.py

@@ -199,10 +199,6 @@ def _post_extract(self, res: List[EntityWalks]) -> List[List[SWalk]]:
             The 2D matrix with its number of rows equal to the number of
             provided entities; number of column equal to the embedding size.
 
-        Raises:
-            NotImplementedError: If this method is called, without having
-                provided an implementation.
-
         """
         return list(
             walks