feat: Add documentation on data config selection#567

Akash-Nayak wants to merge 4 commits intofoundation-model-stack:mainfoundation-model-stack/fms-hf-tuning:mainfrom

Akash-Nayak:data-configs-docAkash-Nayak/fms-hf-tuning:data-configs-docCopy head branch name to clipboard