Fix typos in get_next_train_batch and get_next_eval_batch in auto_unit

[iamyifan]

In torchtnt.framework.auto_unit.py,

The old comments have "PredictUnit" in get_next_train_batch and get_next_eval_batch, which could be a copy-pasta typo from get_next_predict_batch.

The new comments change from "PredictUnit" to "TrainUnit" in get_next_train_batch and "EvalUnit" in get_next_eval_batch.

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