Fix broken doc tests after pytorch#108482 (pytorch#108725)

Tiny fix so I don't wanna revert the PR.

Pull Request resolved: pytorch#108725
Approved by: https://github.com/kit1980

torch/export/__init__.py

@@ -305,8 +305,9 @@ def named_parameters(self) -> Iterator[Tuple[str, torch.nn.Parameter]]:
 
     @compatibility(is_backward_compatible=False)
     def buffers(self) -> Iterator[torch.Tensor]:
-        """Returns an iterator over original module buffers."""
-
+        """
+        Returns an iterator over original module buffers.
+        """
         for _, buf in self.named_buffers():
             yield buf