[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`.