fix hub serving doc

doc/doc_ch/serving.md

@@ -28,12 +28,16 @@ deploy/hubserving/ocr_system/
 # 安装paddlehub  
 pip3 install paddlehub --upgrade -i https://pypi.tuna.tsinghua.edu.cn/simple
 
-# 设置环境变量  
+# 在Linux下设置环境变量
 export PYTHONPATH=.
+# 在Windows下设置环境变量
+SET PYTHONPATH=.
 ```
 
 ### 2. 安装服务模块
-PaddleOCR提供3种服务模块，根据需要安装所需模块。如： 
+PaddleOCR提供3种服务模块，根据需要安装所需模块。
+
+* 在Linux环境下，安装示例如下：
 
 安装检测服务模块：  
 ```hub install deploy/hubserving/ocr_det/```  
@@ -44,6 +48,18 @@ PaddleOCR提供3种服务模块，根据需要安装所需模块。如：
 或，安装检测+识别串联服务模块：  
 ```hub install deploy/hubserving/ocr_system/```
 
+* 在Windows环境下(文件夹的分隔符为`\`)，安装示例如下：
+
+安装检测服务模块：  
+```hub install deploy\hubserving\ocr_det\```  
+
+或，安装识别服务模块：  
+```hub install deploy\hubserving\ocr_rec\```  
+
+或，安装检测+识别串联服务模块：  
+```hub install deploy\hubserving\ocr_system\```
+
+
 ### 3. 启动服务
 #### 方式1. 命令行命令启动（仅支持CPU）
 **启动命令：**  
@@ -157,4 +173,3 @@ hub serving start -c deploy/hubserving/ocr_system/config.json
 
 - 5、重新启动服务  
 ```hub serving start -m ocr_system```  
-

doc/doc_en/serving_en.md

@@ -29,12 +29,16 @@ The following steps take the 2-stage series service as an example. If only the d
 # Install paddlehub  
 pip3 install paddlehub --upgrade -i https://pypi.tuna.tsinghua.edu.cn/simple
 
-# Set environment variables  
+# Set environment variables on Linux
 export PYTHONPATH=.
+# Set environment variables on Windows
+SET PYTHONPATH=.
 ```
 
 ### 2. Install Service Module
-PaddleOCR provides 3 kinds of service modules, install the required modules according to your needs. Such as:  
+PaddleOCR provides 3 kinds of service modules, install the required modules according to your needs.
+
+* On Linux platform, the examples are as follows.
 
 Install the detection service module:  
 ```shell
@@ -49,6 +53,21 @@ Or, install the 2-stage series service module:
 hub install deploy/hubserving/ocr_system/
 ```
 
+* On Windows platform, the examples are as follows.
+
+Install the detection service module:  
+```shell
+hub install deploy\hubserving\ocr_det\
+```  
+Or, install the recognition service module:  
+```shell
+hub install deploy\hubserving\ocr_rec\
+```  
+Or, install the 2-stage series service module:  
+```shell
+hub install deploy\hubserving\ocr_system\
+
+
 ### 3. Start service
 #### Way 1. Start with command line parameters (CPU only)