Fix PR comments

Author: TavoNiievez

src/Codeception/Module/Yii2.php

@@ -279,7 +279,7 @@ public function _initialize(): void
         $this->server = $_SERVER;
         // Adds the required server params. Note this is done separately from the request cycle since someone might call
         // `Url::to` before doing a request, which would instantiate the request component with incorrect server params.
-        $_SERVER = array_merge($_SERVER, $this->getServerParams());
+        $_SERVER = [...$_SERVER, $this->getServerParams()];
     }
 
     /**
@@ -297,7 +297,13 @@ protected function onReconfigure(): void
     }
 
     /**
-     * @return array<string, mixed>
+     * @return array{
+     *     SCRIPT_FILENAME: string,
+     *     SCRIPT_NAME: string,
+     *     SERVER_NAME: string,
+     *     SERVER_PORT: string,
+     *     HTTPS: bool
+     * }
      */
     private function getServerParams(): array
     {