Fix type from "Flux" to "Lux" (#504)

tutorials/03-bayesian-neural-network/index.qmd

@@ -10,7 +10,7 @@ using Pkg;
 Pkg.instantiate();
 ```
 
-In this tutorial, we demonstrate how one can implement a Bayesian Neural Network using a combination of Turing and [Lux](https://github.com/LuxDL/Lux.jl), a suite of machine learning tools. We will use Flux to specify the neural network's layers and Turing to implement the probabilistic inference, with the goal of implementing a classification algorithm.
+In this tutorial, we demonstrate how one can implement a Bayesian Neural Network using a combination of Turing and [Lux](https://github.com/LuxDL/Lux.jl), a suite of machine learning tools. We will use Lux to specify the neural network's layers and Turing to implement the probabilistic inference, with the goal of implementing a classification algorithm.
 
 We will begin with importing the relevant libraries.