[DependencyInjection] Fix parameter description in ConfigurationExten…

…sionInterface

| Q             | A
| ------------- | ---
| Fixed tickets | #10845
| License       | MIT

This fixes the description of parameter `array $config` in file ConfigurationExtensionInterface.php by removing the extra `$config`.

Extension/ConfigurationExtensionInterface.php

@@ -24,7 +24,7 @@ interface ConfigurationExtensionInterface
     /**
      * Returns extension configuration
      *
-     * @param array            $config    $config    An array of configuration values
+     * @param array            $config    An array of configuration values
      * @param ContainerBuilder $container A ContainerBuilder instance
      *
      * @return ConfigurationInterface|null The configuration or null