[FT] Improve Documentation and Examples

Issue encountered

We need better documentation for locally trained LLMs. I am experimenting with finetunes and LoRA adapters but I am having a bad time ironing out the required values for the yaml config.

Solution/Feature

Provide working examples for adapter configurations.

Possible alternatives

Make the library more coherent? --override-batch-size no longer works but it is still available under lighteval accelerate.