Clean up comments in transform.py

[noahho]

Remove unnecessary comment about process_idx parameter.

Issue

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Motivation and Context

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Public API Changes

• No Public API changes
• Yes, Public API changes (Details below)

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How Has This Been Tested?

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Checklist

• The changes have been tested locally.
• Documentation has been updated (if the public API or usage changes).
• A changelog entry has been added (see changelog/README.md), or "no changelog needed" label requested.
• The code follows the project's style guidelines.
• I have considered the impact of these changes on the public API.

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[gemini-code-assist]

Code Review

This pull request removes a comment from the _fit_preprocessing_one function's docstring that referred to a non-existent process_idx parameter. This is a good cleanup that improves the accuracy of the documentation. I see no issues with this change.

[Copilot]

Pull request overview

This PR removes an outdated docstring comment that documented a non-existent process_idx parameter in the _fit_preprocessing_one function. The parameter does not exist in the function signature and is not used anywhere in the function body.

• Cleanup of incorrect documentation in _fit_preprocessing_one function

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