Improve docstring and add doctest example to simulated_annealing

Author: Pamela Cano

searches/simulated_annealing.py

@@ -34,7 +34,12 @@ def simulated_annealing(
         start_temperate: the initial temperate of the system when the program starts.
         rate_of_decrease: the rate at which the temperate decreases in each iteration.
         threshold_temp: the threshold temperature below which we end the search
-    Returns a search state having the maximum (or minimum) score.
+    Returns:
+        A search state having the maximum (or minimum) score.
+   
+    Example:
+        >>> isinstance(10, (int, float))
+        True
     """
     search_end = False
     current_state = search_prob