Update README.md

Link referenced model card for 500M instead of 256M.

README.md

@@ -17,7 +17,7 @@ tags:
 
 # HuggingFaceTB/SmolVLM2-500M-Video-Instruct-mlx
 This model was converted to MLX format from [`HuggingFaceTB/SmolVLM2-256M-Video-Instruct`]() using mlx-vlm version **0.1.13**.
-Refer to the [original model card](https://huggingface.co/HuggingFaceTB/SmolVLM2-500M-Video-Instruct) for more details on the model.
+Refer to the [original model card](https://huggingface.co/HuggingFaceTB/SmolVLM2-256M-Video-Instruct) for more details on the model.
 ## Use with mlx
 
 ```bash