[doc] Fix some docstrings in `src/diffusers/training_utils.py` (#9606) #3804

Job	Run time
Flax TPU Tests	2m 22s
ONNX CUDA Tests	4m 51s
Setup Torch Pipelines CUDA Slow Tests Matrix	1m 38s
Examples PyTorch CUDA tests on Ubuntu	23m 35s
PyTorch Compile CUDA tests	3m 21s
PyTorch xformers CUDA tests	5m 17s
Torch CUDA Tests (models)	6m 5s
Torch CUDA Tests (schedulers)	5m 16s
Torch CUDA Tests (lora)	3m 30s
Torch CUDA Tests (others)	38s
Torch CUDA Tests (single_file)	1m 26s
Torch Pipelines CUDA Tests (cogvideo)	3m 18s
Torch Pipelines CUDA Tests (controlnet)	9m 58s
Torch Pipelines CUDA Tests (ddpm)	33s
Torch Pipelines CUDA Tests (deepfloyd_if)	3m 51s
Torch Pipelines CUDA Tests (flux)	3m 0s
Torch Pipelines CUDA Tests (ip_adapters)	2m 25s
Torch Pipelines CUDA Tests (kandinsky)	4m 46s
Torch Pipelines CUDA Tests (kandinsky2_2)	5m 4s
Torch Pipelines CUDA Tests (kolors)	3m 0s
Torch Pipelines CUDA Tests (latent_consistency_models)	2m 52s
Torch Pipelines CUDA Tests (pixart_alpha)	46s
Torch Pipelines CUDA Tests (stable_diffusion)	5m 0s
Torch Pipelines CUDA Tests (stable_diffusion_2)	4m 18s
Torch Pipelines CUDA Tests (stable_diffusion_3)	1m 13s
Torch Pipelines CUDA Tests (stable_diffusion_adapter)	1m 40s
Torch Pipelines CUDA Tests (stable_diffusion_xl)	5m 55s
Torch Pipelines CUDA Tests (stable_video_diffusion)	2m 36s
Torch Pipelines CUDA Tests (text_to_video_synthesis)	2m 36s
Torch Pipelines CUDA Tests (wuerstchen)	1m 16s
	2h 2m 6s

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