continue to fix distributed_type from TPU to XLA in LM examples (#38652)

[PT0X0E]

What does this PR do?

In some language-modeling and image-pretraining examples, the _no_trainer version training scripts check whether accelerator.distributed_type is TPU. However, TPU is already deprecated in new Accelerator library. They should be changed to XLA.

This is a follow-up fix of #38652 .

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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  Fix typo in Language Modeling example scripts and update TPU type #38652
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[Rocketknight1]

cc @SunMarc