Fix syntax in example code (#35)

Author: dontub

src/Test/Feature/Stub.php

@@ -115,7 +115,7 @@ public function make($class, $params = [])
      * ``` php
      * <?php
      * $this->makeEmpty('User', ['save' => function () { return true; }]);
-     * $this->makeEmpty('User', ['save' => true));
+     * $this->makeEmpty('User', ['save' => true]);
      * ```
      *
      * @template RealInstanceType of object
@@ -312,4 +312,4 @@ public function constructEmptyExcept($class, $method, $constructorParams = [], $
         return $this->mocks[] = \Codeception\Stub::constructEmptyExcept($class, $method, $constructorParams, $params, $this);
     }
 
-}
+}