Add doctests to DFS and BFS. Contributes to #9943 #11757
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Describe your change:
I have added doctests to some functions inside directed_and_undirected_graphs.py file as part of the Hacktoberfest 2024 contributions. I have also improved the dfs and bfs code to better handle edge cases, such as passing -2 as a node, running dfs, bfs on empty graphs, etc.
Contributes to #9943
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