Fix code snippet

README.md

@@ -26,7 +26,7 @@ export HF_HUB_ENABLE_HF_TRANSFER=1
 huggingface-cli download --local-dir Llama-2-7b-mlx mlx-llama/Llama-2-7b-mlx
 
 # Run example
-python mlx-examples/llama/llama.py Llama-2-7b-mlx/ Llama-2-7b-chat-mlx/tokenizer.model "My name is "
+python mlx-examples/llama/llama.py --prompt "My name is" Llama-2-7b-mlx/ Llama-2-7b-mlx/tokenizer.model
 ```
 
 Please, refer to the [original model card](https://huggingface.co/meta-llama/Llama-2-7b/tree/main) for details on Llama 2.