Fix incorrect TrainingArguments example in training.md (#45150)
* Correct comment in training.md for TrainingArguments
Fix comment formatting for TrainingArguments instantiation.
* Update docs/source/en/training.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>