Italian Translation of migration.mdx


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See issue [#17459]
Add italian translation of migration.mdx and update _toctree.yml.
It's my first pull request, so i hope it's ok 

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Models:

- text models: @ArthurZucker and @younesbelkada
- vision models: @amyeroberts
- speech models: @sanchit-gandhi
- graph models: @clefourrier

Library:

- flax: @sanchit-gandhi
- generate: @gante
- pipelines: @Narsil
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @sgugger

Integrations:

- deepspeed: HF Trainer: @stas00, Accelerate: @pacman100
- ray/raytune: @richardliaw, @amogkam

Documentation: @sgugger, @stevhliu and @MKhalusova

HF projects:

- accelerate: [different repo](https://github.com/huggingface/accelerate)
- datasets: [different repo](https://github.com/huggingface/datasets)
- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Maintained examples (not research project or legacy):

- Flax: @sanchit-gandhi
- PyTorch: @sgugger
- TensorFlow: @Rocketknight1

 -->

_The documentation is not available anymore as the PR was closed or merged._<|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks @Baelish03!
Can you move your changes in toctree between *big_models* and *debugging*?

```
- local: big_models
  title: Istanziare un big model
- local: migration
  title: Passaggio da pacchetti precedenti
- local: debugging
  title: Debugging
```

The translation LGTM, only two sentences sound strange, I propose this modification:

192: Se chiamavi i modelli con nomi di parole chiave per argomenti di parole chiave, ad esempio `model(inputs_ids, attention_mask=attention_mask, token_type_ids=token_type_ids)`, questo non dovrebbe causare alcun cambiamento. --> Se inizializzavi i modelli usando parole chiave per gli argomenti, ad esempio `model(inputs_ids, attention_mask=attention_mask, token_type_ids=token_type_ids)`, questo non dovrebbe causare alcun cambiamento.

194: Se chiamavi i modelli con input posizionali per argomenti di parole chiave, ad esempio `model(inputs_ids, attention_mask, token_type_ids)`, potrebbe essere necessario ricontrollare l'ordine esatto degli argomenti di input. --> Se inizializzavi i modelli con input posizionali gli argomenti, ad esempio `model(inputs_ids, attention_mask, token_type_ids)`, potrebbe essere necessario ricontrollare l'ordine esatto degli argomenti di input.<|||||>Thanks for the advice, I re-upload files with corrections<|||||>Thanks @Baelish03 
LGTM @sgugger, @stevhliu and @MKhalusova @omarespejel