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* fix typos in idefics.md

Two typos found in reviewing this documentation.

1) max_new_tokens=4, is not sufficient to generate "Vegetables" as indicated - you will get only "Veget". (incidentally - some mention of how to select this value might be useful as it seems to change in each example)

2) inputs = processor(prompts, return_tensors="pt").to(device) as inputs need to be on the same device (as they are in all other examples on the page)

* Update idefics.md

Change device to cuda explicitly to match other examples

* initial commit for the IDEFICS task guide

* conversational example

* updated TOC

* fixed typos

* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* addressed feedback

* bad_words_ids

* Apply suggestions from code review
Co-authored-by: Victor SANH <victorsanh@gmail.com>

* rank classification note

* feedback addressed

---------
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
Co-authored-by: Victor SANH <victorsanh@gmail.com>