minor update for documentation of BestFirst

Author: brean

pathfinding/finder/best_first.py

@@ -4,7 +4,7 @@
 
 class BestFirst(AStarFinder):
     """
-    Similar to the default A* algorithm from a_star.
+    Best-First implementation, similar to the default A* algorithm from a_star.
     """
     def __init__(self, heuristic=None, weight=1,
                  diagonal_movement=DiagonalMovement.never,