Fix pipeline class on README (#3345)

Update README.md

Author: themrzmaster

examples/community/README.md

@@ -1274,11 +1274,11 @@ mask_url = "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data
 init_image = download_image(img_url).resize((512, 512))
 mask_image = download_image(mask_url).resize((512, 512))
 mask_image = PIL.ImageOps.invert(mask_image)
-pipe = DiffusionPipeline.from_pretrained(
+pipe = StableDiffusionPipeline.from_pretrained(
     "CompVis/stable-diffusion-v1-4", torch_dtype=torch.float16, custom_pipeline="stable_diffusion_repaint",
 )
 pipe.scheduler = RePaintScheduler.from_config(pipe.scheduler.config)
 pipe = pipe.to("cuda")
 prompt = "Face of a yellow cat, high resolution, sitting on a park bench"
 image = pipe(prompt=prompt, image=init_image, mask_image=mask_image).images[0]
-```
+```