Update README.md

README.md

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 ## Fine-tuning and validation data
-Fine tuning is done using the `train` split of the GLUE MNLI dataset and the performance is measured using the `validation_mismatched` split.
+Fine tuning is done using the `train` split of the GLUE MNLI dataset and the performance is measured using the [validation_mismatched](https://huggingface.co/datasets/glue#mnli_mismatched) split.
 
 `validation_mismatched` means validation examples are not derived from the same sources as those in the training set and therefore not closely resembling any of the examples seen at training time.