fix: link

Co-authored-by: Kévin Dunglas <[email protected]>

symfony/testing.md

@@ -1,7 +1,7 @@
 # Testing the API with Symfony
 
-For an introduction to testing using API Platform, refer to the [Core Testing Documentation](/core/testing.md), or access the
-[Laravel Testing Guide](/laravel/testing.md).
+For an introduction to testing using API Platform, refer to the [Core Testing Documentation](../core/testing.md), or access the
+[Laravel Testing Guide](../laravel/testing.md).
 
 Let's learn how to use tests with Symfony!