update description of **kwargs parameter in GraphicalSimulator.sample docstring

Author: daniel-habermann

bayesflow/experimental/graphical_simulator/graphical_simulator.py

@@ -47,7 +47,7 @@ def sample(self, batch_shape: Shape | int, **kwargs) -> dict[str, np.ndarray]:
             The shape of the batch to sample. Typically, a tuple indicating the number of samples,
             but an int can also be passed.
         **kwargs
-            Unused
+            Currently unused
         """
         _ = kwargs  # Simulator class requires **kwargs, which are unused here
         meta_dict = self.meta_fn() if self.meta_fn else {}