improve prose

docs/source/index.mdx

@@ -7,9 +7,9 @@
 TRL is a full stack library where we provide a set of tools to train transformer language models with Reinforcement Learning, from the Supervised Fine-tuning step (SFT), Reward Modeling step (RM) to the Proximal Policy Optimization (PPO) step. 
 The library is integrated with 🤗 [transformers](https://github.com/huggingface/transformers).
 
-## Learn post-training
+## Learn
 
-Learn post-training with the 🤗 [smol course](https://github.com/huggingface/smol-course).
+Learn post-training with TRL and other libraries in 🤗 [smol course](https://github.com/huggingface/smol-course).
 
 ## API documentation