Implement reviewer comments

Author: dabrt

docs/infrastructure_and_maintenance/performance.md

@@ -54,7 +54,9 @@ In production setups:
 
 !!! caution
 
-    If you are running [[= product_name =]] in version v4.6.8 and below, to avoid deprecations when updating from an older PHP version to PHP 8.2 or 8.3, run the following commands:
+    To avoid deprecations when using PHP 8.2 or 8.3, [= product_name =] v4.6.x needs an additional error handler.
+    The error handler is present by default for projects that started with 4.6.8 or later.
+    For projects that started with earlier versions, you need to added the error handler manually by running the following commands:
 
     ``` bash
     composer config extra.runtime.error_handler "\\Ibexa\\Contracts\\Core\\MVC\\Symfony\\ErrorHandler\\Php82HideDeprecationsErrorHandler"

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

@@ -32,6 +32,15 @@ First, run:
 
 Then execute the instructions below starting from the version you're upgrading from.
 
+!!! caution
+
+    To avoid deprecations when using PHP 8.2 or 8.3, run the following commands:
+
+    ``` bash
+    composer config extra.runtime.error_handler "\\Ibexa\\Contracts\\Core\\MVC\\Symfony\\ErrorHandler\\Php82HideDeprecationsErrorHandler"
+    composer dump-autoload
+    ```
+
 <!-- vale Ibexa.VariablesVersion = NO -->
 
 ## v4.6.1
@@ -123,14 +132,7 @@ No additional steps needed.
 
 ## v4.6.8
 
-!!! caution
-
-    To avoid deprecations when updating from an older PHP version to PHP 8.2 or 8.3, run the following commands:
-
-    ``` bash
-    composer config extra.runtime.error_handler "\\Ibexa\\Contracts\\Core\\MVC\\Symfony\\ErrorHandler\\Php82HideDeprecationsErrorHandler"
-    composer dump-autoload
-    ```
+No additional steps needed.
 
 ## v4.6.9