* add
* clean
* up
* clean up more
* fix more tests
* Improve docs further
* improve
* more fixes docs
* Improve docs more
* Update src/diffusers/models/unet_2d_condition.py
* fix
* up
* update doc links
* make fix-copies
* add safety checker and watermarker to stage 3 doc page code snippets
* speed optimizations docs
* memory optimization docs
* make style
* add watermarking snippets to doc string examples
* make style
* use pt_to_pil helper functions in doc strings
* skip mps tests
* Improve safety
* make style
* new logic
* fix
* fix bad onnx design
* make new stable diffusion upscale pipeline model arguments optional
* define has_nsfw_concept when non-pil output type
* lowercase linked to notebook name
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Co-authored-by: William Berman <WLBberman@gmail.com>