Add better docs xformers (huggingface#1487)

* Add better docs xformers

* update

* Apply suggestions from code review

* fix

Author: patrickvonplaten

docs/source/api/pipelines/stable_diffusion.mdx

@@ -78,29 +78,38 @@ If you want to use all possible use cases in a single `DiffusionPipeline` you ca
 	- disable_attention_slicing
 	- enable_vae_slicing
 	- disable_vae_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 ## StableDiffusionImg2ImgPipeline
 [[autodoc]] StableDiffusionImg2ImgPipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 ## StableDiffusionInpaintPipeline
 [[autodoc]] StableDiffusionInpaintPipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
-
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 ## StableDiffusionImageVariationPipeline
 [[autodoc]] StableDiffusionImageVariationPipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 
 ## StableDiffusionUpscalePipeline
 [[autodoc]] StableDiffusionUpscalePipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention

docs/source/using-diffusers/loading.mdx

@@ -378,21 +378,3 @@ dpm = DPMSolverMultistepScheduler.from_pretrained(repo_id, subfolder="scheduler"
 # replace `dpm` with any of `ddpm`, `ddim`, `pndm`, `lms`, `euler`, `euler_anc`
 pipeline = StableDiffusionPipeline.from_pretrained(repo_id, scheduler=dpm)
 ```
-
-## API
-
-[[autodoc]] modeling_utils.ModelMixin
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] pipeline_utils.DiffusionPipeline
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] modeling_flax_utils.FlaxModelMixin
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] pipeline_flax_utils.FlaxDiffusionPipeline
-    - from_pretrained
-    - save_pretrained