Remove stale comment

aesara/scan/op.py

@@ -1486,8 +1486,7 @@ class Scan(Op, ScanMethodsMixin, HasInnerGraph):
             Y sequence outputs y_1, y_2, ... y_<self.n_outs>
 
         """
-        # 1. Unzip the number of steps and sequences. If number of steps is
-        # negative flip sequences around, and make n_steps positive
+        # 1. Unzip the number of steps and sequences.
         t0_call = time.time()
         t_fn = 0
         n_steps = inputs[0]