Add SynCode to llm_tutorial (huggingface#32884)

docs/source/en/llm_tutorial.md

@@ -267,5 +267,6 @@ While the autoregressive generation process is relatively straightforward, makin
 
 1. [`optimum`](https://github.com/huggingface/optimum), an extension of 🤗 Transformers that optimizes for specific hardware devices.
 2. [`outlines`](https://github.com/outlines-dev/outlines), a library where you can constrain text generation (e.g. to generate JSON files);
-3. [`text-generation-inference`](https://github.com/huggingface/text-generation-inference), a production-ready server for LLMs;
-4. [`text-generation-webui`](https://github.com/oobabooga/text-generation-webui), a UI for text generation;
+3. [`SynCode`](https://github.com/uiuc-focal-lab/syncode), a library for context-free grammar guided generation. (e.g. JSON, SQL, Python)
+4. [`text-generation-inference`](https://github.com/huggingface/text-generation-inference), a production-ready server for LLMs;
+5. [`text-generation-webui`](https://github.com/oobabooga/text-generation-webui), a UI for text generation;