Update examples for train API

[andreyvelich]

After this PR: #2075, we should update the HuggingFaceTrainerParams and trainer_parameters arguments in train API PyTorch examples.

/good-first-issue

[google-oss-prow]

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In response to this:

After this PR: #2075, we should update the HuggingFaceTrainerParams and trainer_parameters arguments in train API.

/good-first-issue

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