Added a mention of new type hints

Author: dabrt

docs/index.md

@@ -102,7 +102,7 @@
                             <ul>
                                 <li><a href="release_notes/ibexa_dxp_v5.0/#ai-actions">AI Actions</a></li>
                                 <li><a href="release_notes/ibexa_dxp_v5.0/#discounts">Discounts</a></li>
-                                <li><a href="release_notes/ibexa_dxp_v5.0/#tech-stack-upgrades">Tech stack upgrades</a></li>
+                                <li><a href="release_notes/ibexa_dxp_v5.0/#software-architecture-upgrades">Tech stack upgrades</a></li>
                             </ul>
                         </div>
                         <div class="col-12 col-lg-6 col-fhd-3">

docs/release_notes/ibexa_dxp_v5.0.md

@@ -86,9 +86,9 @@ With performance, coding safety and security in mind, with this version, [[= pro
 
 #### OpenAPI support
 
-Adding support for generating the OpenAPI specification for our REST API makes future changes more manageable, and helps our partners automatically generate REST API clients.
+Adding support for generating the [OpenAPI](https://www.openapis.org/) specification for our REST API makes future changes more manageable, and helps our partners automatically generate REST API clients.
 
-Support for serialization and deserialization of REST payloads with the Symfony Serializer component improves data reliability and simplifies debugging.
+Support for serialization and deserialization of REST payloads with the [Symfony Serializer](https://symfony.com/doc/current/serializer.html) component improves data reliability and simplifies debugging.
 
 ### Developer experience
 
@@ -321,9 +321,10 @@ The following Twig functions have been added in the v5.0 release:
 
 This release brings other minor upgrades intended to improve the developer's experience:
 
-- [New icons](../templating/twig_function_reference/icon_twig_functions.md#icons-reference) that serve as a highlight of a future system design
+- To improve code clarity, reliability, and error detection, type hint declarations that specify the expected data type have been added in multiple places throughout the product
 - Improved DX with capabilities offered by PHP in version 8.3. For example, the `AsTwigComponent` attribute [facilitates autoconfiguration](components.md#php-code) of Twig components
 - The introduction of [[[= product_name_base =]] Rector package](https://github.com/ibexa/rector) that is based on [Rector](https://github.com/rectorphp) and comes with additional rules for working with Ibexa code. You can use it to get rid of PHP code deprecations
+- [New icons](../templating/twig_function_reference/icon_twig_functions.md#icons-reference) that serve as a highlight of a future system design
 
 ### Deprecations
 

docs/release_notes/ibexa_dxp_v5.0_deprecations.md

@@ -16,7 +16,7 @@ These changes include dropped packages, changing database table and column names
 ## Dropped packages
 
 [[= product_name =]] v5.0 no longer includes legacy Commerce packages.
-The solution has been replaced with [Commerce](commerce.md) that is included as standard and enhanced since v4.4.
+The solution has been replaced with [Commerce](commerce.md) that is included as standard and has been continuously developed since v4.4.
 
 Also, packages `compatibility-layer` and `icons` have been dropped.