change pip3 -> python3 -m pip

doc/doc_ch/installation.md

@@ -47,9 +47,9 @@ docker images
 hub.baidubce.com/paddlepaddle/paddle   latest-gpu-cuda9.0-cudnn7-dev    f56310dcc829
 ```
 
-**2. 安装PaddlePaddle Fluid v2.0**
+**2. 安装PaddlePaddle v2.0**
 ```
-pip3 install --upgrade pip
+python3 -m pip install --upgrade pip
 
 如果您的机器安装的是CUDA9或CUDA10，请运行以下命令安装
 python3 -m pip install paddlepaddle-gpu==2.0.0b0 -i https://mirror.baidu.com/pypi/simple
@@ -75,7 +75,7 @@ git clone https://gitee.com/paddlepaddle/PaddleOCR
 **4. 安装第三方库**
 ```
 cd PaddleOCR
-pip3 install -r requirments.txt
+python3 -m pip install -r requirments.txt
 ```
 
 注意，windows环境下，建议从[这里](https://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely)下载shapely安装包完成安装，

doc/doc_en/installation_en.md

@@ -18,7 +18,7 @@ cd /home/Projects
 # You need to create a docker container for the first run, and do not need to run the current command when you run it again
 # Create a docker container named ppocr and map the current directory to the /paddle directory of the container
 
-#If using CPU, use docker instead of nvidia-docker to create docker
+# If using CPU, use docker instead of nvidia-docker to create docker
 sudo docker run --name ppocr -v $PWD:/paddle --network=host -it hub.baidubce.com/paddlepaddle/paddle:latest-gpu-cuda9.0-cudnn7-dev /bin/bash
 ```
 If using CUDA9, please run the following command to create a container:
@@ -49,9 +49,9 @@ docker images
 hub.baidubce.com/paddlepaddle/paddle   latest-gpu-cuda9.0-cudnn7-dev    f56310dcc829
 ```
 
-**2. Install PaddlePaddle Fluid v2.0**
+**2. Install PaddlePaddle v2.0**
 ```
-pip3 install --upgrade pip
+python3 -m pip install --upgrade pip
 
 # If you have cuda9 or cuda10 installed on your machine, please run the following command to install
 python3 -m pip install paddlepaddle-gpu==2.0.0b0 -i https://mirror.baidu.com/pypi/simple
@@ -77,7 +77,7 @@ git clone https://gitee.com/paddlepaddle/PaddleOCR
 **4. Install third-party libraries**
 ```
 cd PaddleOCR
-pip3 install -r requirments.txt
+python3 -m pip install -r requirments.txt
 ```
 
 If you getting this error `OSError: [WinError 126] The specified module could not be found` when you install shapely on windows.