[LoRA training] update metadata use for lora alpha + README (#11723)
* lora alpha
* Apply style fixes
* Update examples/advanced_diffusion_training/README_flux.md
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* fix readme format
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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>