minor #15723 [OptionsResolver] Fix code sample for chaining (wouterj, JakeFr)

This PR was merged into the 5.3 branch.

Discussion
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[OptionsResolver] Fix code sample for chaining

OptionConfigurator::allowedValues is a variadic function.

Commits
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895b840 Update notifier.rst
65a32a6 [OptionsResolver] Fix code sample for chaining

Author: javiereguiluz

components/options_resolver.rst

@@ -883,7 +883,7 @@ method::
             $resolver->define('transport')
                 ->required()
                 ->default('transport')
-                ->allowedValues(['sendmail', 'mail', 'smtp']);
+                ->allowedValues('sendmail', 'mail', 'smtp');
         }
     }
 

notifier.rst

@@ -529,7 +529,7 @@ sent using the Slack transport::
                 ->content('You got a new invoice for 15 EUR.')
                 ->importance(Notification::IMPORTANCE_HIGH);
 
-            $notifier->send($notification, new Recipient('wouter@example.com'));
+            $notifier->send($notification, new Recipient('wouter@wouterj.nl'));
 
             // ...
         }