Update installs in image classification doc

[MariaHei]

What does this PR do?

Trainer with PyTorch now requires accelerate to be installed. Therefore, accelerate is added to the list of libraries to be installed.

Fixes #29174 (partly)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

Who can review?

@stevhliu and @MKhalusova

[HuggingFaceDocBuilderDev]

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[stevhliu]

Thanks for the update! 🤗