docs(api-server): update data access flow guide link

- Replace incorrect link with correct URL for the Architectural Deep Dive guide
- Ensure proper navigation to the intended resource

Author: fulleni

src/content/docs/api-server/architecture/generic-data-endpoint.mdx

@@ -34,5 +34,5 @@ When a request comes in, middleware uses the `ModelRegistry` to authorize the re
 </Aside>
 
 <Aside type="tip">
-For a complete, step-by-step walkthrough of how the endpoint, registries, and middleware work together, see the [**Architectural Deep Dive: Data Access Flow**](./data-access-flow) guide.
+For a complete, step-by-step walkthrough of how the endpoint, registries, and middleware work together, see the [**Architectural Deep Dive: Data Access Flow**](/docs/api-server/architecture/generic-data-endpoint/) guide.
 </Aside>