Small update in README.md (#685)

README.md

-[English](README_en.md) | 简体中文
+简体中文 | [English](README_en.md)
+
+文档：[https://paddledetection.readthedocs.io](https://paddledetection.readthedocs.io)
 
 # PaddleDetection
 
@@ -90,8 +92,6 @@
 
 ## 文档教程
 
-**最新动态：** 已发布文档教程：[https://paddledetection.readthedocs.io](https://paddledetection.readthedocs.io)
-
 ### 入门教程
 
 - [安装说明](docs/tutorials/INSTALL_cn.md)
@@ -102,7 +102,9 @@
 ### 进阶教程
 - [数据预处理及自定义数据集](docs/advanced_tutorials/READER.md)
 - [搭建模型步骤](docs/advanced_tutorials/MODEL_TECHNICAL.md)
-- [配置模块设计和介绍](docs/advanced_tutorials/CONFIG_cn.md)
+- 模型参数配置:
+  - [配置模块设计和介绍](docs/advanced_tutorials/CONFIG_cn.md)
+  - [RCNN模型参数说明](docs/advanced_tutorials/RCNN_PARAMS_DOC.md)
 - [迁移学习教程](docs/advanced_tutorials/TRANSFER_LEARNING_cn.md)
 - [IPython Notebook demo](demo/mask_rcnn_demo.ipynb)
 - [模型压缩](slim)

README_en.md

 English | [简体中文](README.md)
 
+Documentation:[https://paddledetection.readthedocs.io](https://paddledetection.readthedocs.io)
+
 # PaddleDetection
 
 PaddleDetection is an end-to-end object detection development kit based on PaddlePaddle, which
@@ -103,7 +105,6 @@ The following is the relationship between COCO mAP and FPS on Tesla V100 of repr
 
 ## Tutorials
 
-**News:** Documentation:[https://paddledetection.readthedocs.io](https://paddledetection.readthedocs.io)
 
 ### Get Started
 
@@ -116,8 +117,10 @@ The following is the relationship between COCO mAP and FPS on Tesla V100 of repr
 
 - [Guide to preprocess pipeline and custom dataset](docs/advanced_tutorials/READER.md)
 - [Models technical](docs/advanced_tutorials/MODEL_TECHNICAL.md)
-- [Introduction to the configuration workflow](docs/advanced_tutorials/CONFIG.md)
 - [Transfer learning document](docs/advanced_tutorials/TRANSFER_LEARNING.md)
+- Parameter configuration:
+  - [Introduction to the configuration workflow](docs/advanced_tutorials/CONFIG.md)
+  - [Parameter configuration for RCNN model](docs/advanced_tutorials/RCNN_PARAMS_DOC.md)
 - [IPython Notebook demo](demo/mask_rcnn_demo.ipynb)
 - [Model compression](slim)
     - [Model compression benchmark](slim)