Update book branch

burn-book/src/basic-workflow/README.md

@@ -4,7 +4,7 @@ This guide will walk you through the process of creating a custom model built wi
 train a simple convolutional neural network model on the MNIST dataset and prepare it for inference.
 
 For clarity, we sometimes omit imports in our code snippets. For more details, please refer to the
-corresponding code in the `examples/guide` [directory](https://github.com/tracel-ai/burn/tree/main/examples/guide).
+corresponding code in the `examples/guide` [directory](https://github.com/tracel-ai/burn/tree/release/0.15/examples/guide).
 We reproduce this example in a step-by-step fashion, from dataset creation to modeling and training
 in the following sections. It is recommended to use the capabilities of your IDE or text editor to
 automatically add the missing imports as you add the code snippets to your code.