Fix phpdoc

lib/SimpleSAML/Error/CriticalConfigurationError.php

@@ -41,7 +41,7 @@ class CriticalConfigurationError extends ConfigurationError
      *
      * @param string|null $reason The reason for this critical error.
      * @param string|null $file The configuration file that originated this error.
-     * @param array|null The configuration array that led to this problem.
+     * @param array|null $config The configuration array that led to this problem.
      */
     public function __construct($reason = null, $file = null, $config = null)
     {