Update dfs-based.md

docs/docs/algorithms/cycle-detection/dfs-based.md

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 # DFS Based Cycle Detection
 A DFS based cycle detection algorithm is used to identify cycles in graphs, both directed and undirected.
-The algorithm doesn't work on edges with weight and therefore cannot be used for negative weight cycles.
+The algorithm can be used to detect cycles in the structure of a graph, as it does not consider edge weights.
 
 # Directed graph
 The key idea is that when a vertex is processed, mark it as: UNVISITED, VISITED and NO_CYCLE.