Left the term fine-tuning since there is no correct translation into Italian and the English term is generally used. The same was done with some terms like "learning rate"
* added training.mdx * updated training.mdx * updated training.mdx * updated training.mdx * updated _toctree.yml * fixed typos after review Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>