doc: fix sample code

README.md

@@ -35,7 +35,7 @@ In version 1.2.1, the following special tags can be used
 
 # 🧨 Diffusers
 
-```
+```py
 from diffusers import StableDiffusionPipeline
 import torch
 
@@ -43,7 +43,7 @@ model_id = "p1atdev/plat-diffusion"
 pipe = StableDiffusionPipeline.from_pretrained(model_id, torch_dtype=torch.float16)
 pipe = pipe.to("cuda")
 
-prompt = "masterpiece, 1girl, "
+prompt = "masterpiece, 1girl, surrounded by many flowers"
 image = pipe(prompt).images[0]  
     
 image.save("girl.png")