Dataset docstring change (#2575)

Summary:
Quick docstring change, adding extra line to properly parse

Pull Request resolved: https://github.com/pytorch/audio/pull/2575

Reviewed By: mthrok

Differential Revision: D38138566

Pulled By: skim0514

fbshipit-source-id: fc1ed68ed0050e194944714c753fb35adc85b27e

torchaudio/datasets/musdb_hq.py

@@ -117,6 +117,7 @@ class MUSDB_HQ(Dataset):
 
     def __getitem__(self, n: int) -> Tuple[torch.Tensor, int, int, str]:
         """Load the n-th sample from the dataset.
+
         Args:
             n (int): The index of the sample to be loaded
         Returns: