docs: replace torch.distributed.run by torchrun (#27528)

* docs: replace torch.distributed.run by torchrun

 `transformers` now officially support pytorch >= 1.10.
 The entrypoint `torchrun`` is present from 1.10 onwards.

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>

* Update src/transformers/trainer.py

with @ArthurZucker's suggestion

Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

---------

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

docs/source/it/run_scripts.md

@@ -130,7 +130,7 @@ Il [Trainer](https://huggingface.co/docs/transformers/main_classes/trainer) supp
 - Imposta un numero di GPU da usare con l'argomento `nproc_per_node`.
 
 ```bash
-python -m torch.distributed.launch \
+torchrun \
     --nproc_per_node 8 pytorch/summarization/run_summarization.py \
     --fp16 \
     --model_name_or_path t5-small \