Update README.md

README.md

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 # PGLearn Datasets
 
-This HuggingFace organization hosts the PGLearn datasets, described in https://arxiv.org/abs/2505.22825v1.
+This HuggingFace organization hosts the PGLearn datasets, described in https://arxiv.org/abs/2505.22825.
 
 | Collection                   | Link                                                          | #feasible | #samples |
 |------------------------------|---------------------------------------------------------------|-----------|----------|