update admin-business/index.markdown.

Signed-off-by: Jay_he <1044295598@qq.com>

Author: CJayHe

admin-business/index.markdown

@@ -120,7 +120,7 @@ public static function get(ContainerInterface $container)
     switch (PlatformClass::getPlatform()){
         case $container->get('parameter_bag')->get('platform_admin'):
             $user_auth_id = $container->get('session')->get(PlatformClass::getPlatform() . $container->get('parameter_bag')->get('login_tag_session_name'));
-            $userAuth = $doctrine->getRepository('App:UserAuth')->find($user_auth_id);
+            $userAuth = $doctrine->getRepository(UserAuth::class)->find($user_auth_id);
             break;
         default:
             throw new \Exception('来源溢出');