doc: 修改认证文档参数值为形参

操作文档/LDP中应用统一认证及权限配置.md

@@ -262,7 +262,7 @@ router.beforeEach(async(to, from, next) = >{
                 //token
                 X-Ldp-Token: userToken,
                 //应用领域编码
-                X-Realm: 'app'
+                X-Realm: realmcode
             }
         }).then(res = >{
             console.log('用户信息:' + res.data)