[Doc] Add DeepCache in section `optimization/General optimizations` (#6390)
* add documentation for DeepCache
* fix typo
* add wandb url for DeepCache
* fix some typos
* add item in _toctree.yml
* update formats for arguments
* Update deepcache.md
* Update docs/source/en/optimization/deepcache.md
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* add StableDiffusionXLPipeline in doc
* Separate SDPipeline and SDXLPipeline
* Add the paper link of ablation experiments for hyper-parameters
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>