Added async config parameter to use async S3 adapter

src/DependencyInjection/SonataMediaExtension.php

@@ -266,9 +266,9 @@ public function configureFilesystemAdapter(ContainerBuilder $container, array $c
         if ($container->hasDefinition('sonata.media.adapter.filesystem.s3') && isset($config['filesystem']['s3'])) {
             $async = true === $config['filesystem']['s3']['async'];
             if (true === $async && !class_exists(SimpleS3Client::class)) {
-                throw new \RuntimeException('You must install "async-aws/simple-s3" to use async adapter');
+                throw new \RuntimeException('You must install "async-aws/simple-s3" to use async S3 adapter');
             } elseif (false === $async && !class_exists(S3Client::class)) {
-                throw new \RuntimeException('You must install "aws/aws-sdk-php" to use async adapter');
+                throw new \RuntimeException('You must install "aws/aws-sdk-php" to use Amazon S3 filesystem');
             }
 
             $adapterClass = $async ? AsyncAwsS3::class : AwsS3::class;