fixed merge issue

Author: MatheMagicianPi

src/sage/dynamics/arithmetic_dynamics/dynamical_semigroup.py

@@ -651,7 +651,7 @@ def orbit(self, p, n):
             current_iterate = next_iterate
         return tuple(result)
 
-    def __pow__(self, n):
+    def __mul__(self, n):
         r"""
         Return a new :class:`DynamicalSemigroup` that is the result of multiplying
         this dynamical semigroup with another dynamical semigroup of the same type