Readme instructions are incorrect

wrong arg name for run_training in documentation https://github.com/instructlab/training?tab=readme-ov-file#learning-about-torchrunargs-arguments
```
run_training(
    torchrun_args=torchrun_args,
    training_args=training_args,
)
```
should be
```
run_training(
    torch_args=torchrun_args,
    train_args=training_args,
)
```