[Docs] Include more information in the "controlling generation" doc (#2434)
* edit controlling generation doc.
* add: demo link to pix2pix zero docs.
* refactor oanorama a bit.
* Apply suggestions from code review
Co-authored-by: Pedro Cuenca <pedro@huggingface.co>
* pix: typo.
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Co-authored-by: Pedro Cuenca <pedro@huggingface.co>