Fix incorrect compute param example in SageMakerNotebookHook docstring

[sagnjun-nam]

The compute parameter example in SageMakerNotebookHook and SageMakerNotebookOperator docstrings incorrectly shows image_uri as a direct field, but the SageMaker Unified Studio API expects image_details with either ecr_uri or image_name/image_version combination.

Reference: https://docs.aws.amazon.com/sagemaker-unified-studio/latest/userguide/remote-execution-apis.html#remote-start-execution

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[boring-cyborg]

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[vincbeck]

Looks good to me but some tests need to be fixed

[o-nikolas]

Looks good to me but some tests need to be fixed

+1, sphinx gets very upset when there is indented code looking examples in the docs. I reckon this is why it was all on one line previously. Your PR for this fix doesn't necessarily need to include that reformatting. The easiest fix would be to just put it back to a single line.

[boring-cyborg]

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