Is the number of edges of dataset "KarateClub" correct?

[PolarisRisingWar]

I find from torch_geometric.datasets.karate — pytorch_geometric 1.7.0 documentation that this class is to download dataset from NetworkX and handle it.
The number of edges in NetworkX dataset karate_club_graph has 78 edges (get by code: G = nx.karate_club_graph(); print(G.number_of_edges()); ) and in PyG it uses edge_index, so in PyG it should have 156 (2*78) edges (and by code dataset = KarateClub(); data = dataset[0]; print(data) I can get edge_index=[2, 156]). But in the document and source code of KarateClub, it says that connected by 154 (undirected and unweighted) edges.
So I think it's wrong. If it's really wrong, how could I post that issue? I think it may be less serious than a bug?

[rusty1s]

Thanks for spotting. I fixed the typo in documentation. Thank you very much!