Update index.md (#496)

I've just corrected a typo. 

Thank you so much for this great package!

Author: pitmonticone

docs/src/index.md

@@ -112,7 +112,7 @@ methodology, and are showcased in tutorials and layer functions:
 - Hamiltonian Neural Networks (with specialized second order and symplectic integrators)
 - Legrangian Neural Networks
 - Continuous Normalizing Flows (CNF) and FFJORD
-- Galerkin Nerual ODEs
+- Galerkin Neural ODEs
 
 ## Modularity and Composability