Update README.md

Author: LukeProducts

README.md

@@ -172,7 +172,7 @@ All this settings could be adjusted in the __#define__ statements at the beginni
 
 This is because **AStar()** needs this 2-dimensional vector <br>
 to figure out wheather its a walkable or not walkable terrain. <br><br>
-**prepare_maze()** can handle a vector consisting of strings or another char-vector as param. <br>
+**prepare_maze()** can handle a vector\<string> or another vector\<vector\<char>>. <br>
 
 https://github.com/LukeProducts/AStar-Pathfinding-Cpp/blob/14c2a2b6773bd87094b09eae8189e36539831fc7/examples/prepare_maze.cpp#L7-L32