feat(code): small fix on static usage & clone usage added

Author: Guikingone

service_container/injection_types.rst

@@ -275,10 +275,7 @@ this approach allow you to make a service immutable::
          */
         public function withMailer(MailerInterface $mailer)
         {
-            $new = clone $this;
-            $new->mailer = $mailer;
-            
-            return $new
+            return new static($mailer);
         }
 
         // ...
@@ -330,6 +327,31 @@ which allow the container to return the newly created service:
         $container->register('app.newsletter_manager', NewsletterManager::class)
             ->addMethodCall('withMailer', [new Reference('mailer')], true);
 
+This example is pretty simple, let's imagine that you have a simple service
+which use a `LoggerAwareTrait`::
+
+    class RandomService
+    {
+        use LoggerAwareTrait;
+    }
+
+    trait LoggerAwareTrait
+    {
+        private $logger;
+
+        /**
+         * @return static
+         */
+        public function withLogger(LoggerInterface $logger)
+        {
+            $new = clone $this;
+            $new->logger = $logger;
+
+            return $new;
+        }
+    }
+
+
 This approach is useful if you need to configure your service according to your needs, 
 so, what are the advantages?