Mainly backward compatibility fixes with SFTTrainer.

What's Changed

• Fixed doc string and related docs for the SFTConfig update by @GuilhermeFreire in https://github.com/huggingface/trl/pull/1706
• SFTTrainer: Fix backward Compatibility issue with TrainingArguments by @younesbelkada in https://github.com/huggingface/trl/pull/1707
• 0.9.4 release by @vwxyzjn in https://github.com/huggingface/trl/pull/1708

New Contributors

• @GuilhermeFreire made their first contribution in https://github.com/huggingface/trl/pull/1706

Full Changelog: https://github.com/huggingface/trl/compare/v0.9.3...v0.9.4