[Docs] Add GPT2ForSequenceClassification to supported models in docs

[nie3e]

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• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

This PR adds model from #19663 to supported models in documentation.

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @nie3e, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the project's documentation to accurately reflect the support for GPT2ForSequenceClassification. It ensures that users can quickly identify this model as compatible for classification tasks by adding it to the relevant section of the documentation.

Highlights

• Documentation Update: Added GPT2ForSequenceClassification to the supported_models.md documentation, explicitly listing it as a supported model for classification tasks.

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[gemini-code-assist]

Code Review

This pull request adds GPT2ForSequenceClassification to the list of supported models in the documentation. I've suggested a small improvement to maintain stylistic consistency with the rest of the table.