Apply suggestions from code review

Co-authored-by: Marek Nocoń <mnocon@users.noreply.github.com>

Author: dabrt

docs/infrastructure_and_maintenance/performance.md

@@ -54,7 +54,7 @@ In production setups:
 
 !!! caution
 
-    To avoid deprecations when using PHP 8.2 or 8.3, [= product_name =] v4.6.x needs an additional error handler.
+    To avoid deprecations when using PHP 8.2 or 8.3, [[= product_name =]] v4.6 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 add the error handler manually by running the following commands:
 
@@ -63,8 +63,6 @@ In production setups:
     composer dump-autoload
     ```
 
-    In newer versions of [[= product_name =]], the error handler is added by default.
-
 ### Symfony
 
 - Review the [Symfony performance documentation]([[= symfony_doc =]]/performance.html) and apply matching suggestions, including OPCache configuration if enabled.