[FIX] bad indentation in the docstring of nadam

Author: fabianp

optax/_src/alias.py

@@ -455,7 +455,7 @@ def adam(
       >>> for _ in range(5):
       ...  grad = jax.grad(f)(params)
       ...  updates, opt_state = solver.update(grad, opt_state, params)
-    ...  params = optax.apply_updates(params, updates)
+      ...  params = optax.apply_updates(params, updates)
       ...  print('Objective function: {:.2E}'.format(f(params)))
       Objective function:  13.947006
       Objective function:  13.905494