config: fix link to Fabricator API

Signed-off-by: Pau Capdevila <[email protected]>

Author: pau-hedgehog

docs/install-upgrade/config.md

@@ -31,7 +31,7 @@ After the above workflow a user will have a .img file suitable for installing th
 
 ## Complete Example File
 
-The following example outlines a comprehensive Fabricator configuration. You can find further configuration details in the Fabricator [API Reference](/reference/fab-api.md).
+The following example outlines a comprehensive Fabricator configuration. You can find further configuration details in the Fabricator [API Reference](reference/fab-api/).
 
 ``` { .yaml .annotate title="fab.yaml" linenums="1"} 
 apiVersion: fabricator.githedgehog.com/v1beta1