[ONNX] Update export docstring

[justinchuby]

Update export docstring to reflect the latest configuration.

cc @titaiwangms

[pytorch-bot]

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[Copilot]

Pull Request Overview

This PR updates the ONNX export function's docstring to reflect the latest configuration changes, particularly that dynamo export is now the recommended and default approach for ONNX export.

• Reorganized function parameters to group backward compatibility and deprecated options separately
• Updated documentation to clarify that dynamo=True is the recommended and default way to export
• Enhanced parameter descriptions with more detailed explanations and usage guidance

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[justinchuby]

@pytorchbot merge

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[justinchuby]

@pytorchbot merge -f "docs change only. Docs build CI passed"

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[justinchuby]

@pytorchbot cherry-pick --onto release/2.9 --fixes "Documentation updates for torch.onnx.export" -c docs

[pytorchbot]

Cherry picking #162622

The cherry pick PR is at #162637 and it is linked with issue Documentation updates for torch.onnx.export. The following tracker issues are updated:

• [v.2.9.0] Release Tracker #162497 (comment)

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