Added Paweł's remark

Author: mnocon

docs/update_and_migration/from_3.3/update_from_3.3.md

@@ -518,7 +518,7 @@ See [the updated Apache and nginx template files](https://github.com/ibexa/post-
 
 This release no longer directly requires the `symfony/serializer-pack` Composer dependency, which can remove some dependencies from your project during the update process.
 
-If you rely on them in your project and need to continue using them, run the following command before updating [[= product_name_base =]] packages:
+If you rely on them in your project, for example by using Symfony's `ObjectNormalizer` to create your own REST endpoints, run the following command before updating [[= product_name_base =]] packages:
 
 ``` bash
 composer require symfony/serializer-pack

docs/update_and_migration/from_4.6/update_from_4.6.md

@@ -238,7 +238,7 @@ See [the updated Apache and nginx template files](https://github.com/ibexa/post-
 
 This release no longer directly requires the `symfony/orm-pack` and `symfony/serializer-pack` Composer dependencies, which can remove some dependencies from your project during the update process.
 
-If you rely on them in your project and need to continue using them, run the following command before updating [[= product_name_base =]] packages:
+If you rely on them in your project, for example by using Symfony's `ObjectNormalizer` to create your own REST endpoints, run the following command before updating [[= product_name_base =]] packages:
 
 ``` bash
 composer require symfony/serializer-pack symfony/orm-pack