Apply suggestion from @regisss

Co-authored-by: regisss <15324346+regisss@users.noreply.github.com>

Author: AKloniecki

docs/source/tutorials/stable_diffusion.mdx

@@ -98,7 +98,7 @@ outputs = pipeline(
 
 <Tip>
 
-There are two different checkpoints for Stable Diffusion 2 ():
+There are two different checkpoints for Stable Diffusion 2:
 
 - use [sd2-community/stable-diffusion-2-1](https://huggingface.co/sd2-community/stable-diffusion-2-1) for generating 768x768 images
 - use [sd2-community/stable-diffusion-2-1-base](https://huggingface.co/sd2-community/stable-diffusion-2-1-base) for generating 512x512 images