Fix source link in LinkCutTree.h (#278)

Author: JJCUBER

content/graph/LinkCutTree.h

@@ -1,7 +1,7 @@
 /**
  * Author: Simon Lindholm
  * Date: 2016-07-25
- * Source: https://github.com/ngthanhtrung23/ACM_Notebook_new/blob/master/DataStructure/LinkCut.h
+ * Source: https://github.com/ngthanhtrung23/ACM_Notebook_new/blob/master/DataStructure/LinkCutTree.h
  * Description: Represents a forest of unrooted trees. You can add and remove
  * edges (as long as the result is still a forest), and check whether
  * two nodes are in the same tree.