fix comment misdirection during scaling loss
Author: techkang
Pull request: yes

# What does this PR do?
If the GA loss bug is not fixed, we should scale the loss properly. However, it is not solely for reporting purposes as described in the previous comment. https://github.com/huggingface/transformers/blob/main/src/transformers/trainer.py#L3764
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cc @muellerzr @SunMarc