Super tiny fix logging message
Author: fzyzcjy
Pull request: yes

# What does this PR do?

Hi thanks for the library! When looking at mlflow callback (I wanted to customize some detailed behavior for it), it seems a line of log has a typo.

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Fixes # (issue)


## Before submitting
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_35132). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

You are welcome!