Fixed broken link

Author: samejr

docs/migrating-from-v3.mdx

@@ -107,7 +107,7 @@ const myTask = task({
 });
 ```
 
-This has now been deprecated in favor of the `locals` API and middleware. See the [Improved middleware and locals](#improved-middleware-and-locals) section for more details.
+This has now been deprecated in favor of the `locals` API and middleware. See the [Improved middleware and locals](/tasks/overview#middleware-and-locals-functions) section for more details.
 
 ### toolTask