Fix get_batch_loss_metrics comments (#413)

## Summary

Remove misleading docstring in `get_batch_loss_metrics()` of
`test/utils.py`.

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Signed-off-by: Austin Liu <[email protected]>

Author: austin362667

test/utils.py

@@ -483,7 +483,7 @@ def get_batch_loss_metrics(
         ref_bias: torch.FloatTensor = None,
         average_log_prob: bool = True,
     ):
-        """Compute the ORPO loss and other metrics for the given batch of inputs for train or test."""
+        """Compute the loss metrics for the given batch of inputs for train or test."""
 
         forward_output = self.concatenated_forward(
             _input, weight, target, bias, average_log_prob