Fix article-3 blog link (correct slug)

README.md

@@ -66,7 +66,7 @@ Cadence is a **Universal-Transformer-style looped transformer** applied to Frenc
 
 ## Related
 
-- ✍️ Write-up (Article 3): *Teaching a 15M French LLM to think deeper* — [Hugging Face blog](https://huggingface.co/blog/RDTvlokip/teaching-my-llm-to-think-deeper)
+- ✍️ Write-up (Article 3): *Teaching a 15M French LLM to think deeper* — [Hugging Face blog](https://huggingface.co/blog/RDTvlokip/teaching-a-15m-french-llm-to-think-deeper)
 - 🧪 **Focal** (in-domain variant): [RDTvlokip/Focal-15M-fr](https://huggingface.co/RDTvlokip/Focal-15M-fr)
 - 🧭 **Nomade** (out-of-domain variant): [RDTvlokip/Nomade-15M-fr](https://huggingface.co/RDTvlokip/Nomade-15M-fr)