Correct Pix2Pix example (#2056)

* Correct Pix2Pix example

- no advertisement of revision -> it'll be deprecated soon
- by default safety checker should be used

* Update docs/source/en/api/pipelines/stable_diffusion/pix2pix.mdx

* up

docs/source/en/api/pipelines/stable_diffusion/pix2pix.mdx

@@ -46,7 +46,7 @@ from diffusers import StableDiffusionInstructPix2PixPipeline
 
 model_id = "timbrooks/instruct-pix2pix"
 pipe = StableDiffusionInstructPix2PixPipeline.from_pretrained(
-    model_id, torch_dtype=torch.float16, revision="fp16", safety_checker=None
+    model_id, torch_dtype=torch.float16, safety_checker=None
 ).to("cuda")
 
 url = "https://raw.githubusercontent.com/timothybrooks/instruct-pix2pix/main/imgs/example.jpg"