Minor tweaks

Author: javiereguiluz

service_container/alias_private.rst

@@ -181,8 +181,8 @@ This means that when using the container directly, you can access the
             # ...
             app.mailer: '@App\Mail\PhpMailer'
 
-The ``#[AsAlias]`` attribute also support per-environment configuration
-via the ``when`` argument::
+The ``#[AsAlias]`` attribute can also be limited to one or more specific
+:ref:`config environments <configuration-environments>` using the ``when`` argument::
 
     // src/Mail/PhpMailer.php
     namespace App\Mail;
@@ -196,11 +196,16 @@ via the ``when`` argument::
         // ...
     }
 
-You can pass either a string or an array of strings to the ``when`` argument.
+    // pass an array to apply it in multiple config environments
+    #[AsAlias(id: 'app.mailer', when: ['dev', 'test'])]
+    class PhpMailer
+    {
+        // ...
+    }
 
 .. versionadded:: 7.3
 
-    The ``when`` argument on the ``#[AsAlias]`` attribute was introduced in Symfony 7.3.
+    The ``when`` argument of the ``#[AsAlias]`` attribute was introduced in Symfony 7.3.
 
 .. tip::