Fix newline

Author: danielward27

docs/index.md

@@ -78,7 +78,7 @@ If this quick start has got you interested, then have a read of [All of Equinox]
 **Deep learning**  
 [Optax](https://github.com/deepmind/optax): first-order gradient (SGD, Adam, ...) optimisers.  
 [Orbax](https://github.com/google/orbax): checkpointing (async/multi-host/multi-device).  
-[Levanter](https://github.com/stanford-crfm/levanter): scalable+reliable training of foundation models (e.g. LLMs).
+[Levanter](https://github.com/stanford-crfm/levanter): scalable+reliable training of foundation models (e.g. LLMs).  
 [paramax](https://github.com/danielward27/paramax): parameterizations and constraints for PyTrees.
 
 **Scientific computing**