modify install GPU 97 (#18768)

* modify install GPU97

* modify install GPU97

README.md

@@ -23,12 +23,13 @@ Please refer to our [release announcement](https://github.com/PaddlePaddle/Paddl
 ```
 # Linux CPU
 pip install paddlepaddle
-# Linux GPU cuda9cudnn7
-pip install paddlepaddle-gpu
 # Linux GPU cuda10cudnn7
-pip install paddlepaddle-gpu==1.5.1.post107
+pip install paddlepaddle-gpu
 # Linux GPU cuda8cudnn7
 pip install paddlepaddle-gpu==1.5.1.post87
+# Linux GPU cuda9cudnn7
+pip install paddlepaddle-gpu==1.5.1.post97
+
 
 # For installation on other platform, refer to http://paddlepaddle.org/
 ```

README_cn.md

@@ -21,12 +21,13 @@ PaddlePaddle (PArallel Distributed Deep LEarning) 是一个简单易用、高效
 ```
 # Linux CPU
 pip install paddlepaddle
-# Linux GPU cuda9cudnn7
-pip install paddlepaddle-gpu
 # Linux GPU cuda10cudnn7
-pip install paddlepaddle-gpu==1.5.1.post107
+pip install paddlepaddle-gpu
 # Linux GPU cuda8cudnn7
 pip install paddlepaddle-gpu==1.5.1.post87
+# Linux GPU cuda9cudnn7
+pip install paddlepaddle-gpu==1.5.1.post97
+
 
 # 其他平台上的安装指引请参考 http://paddlepaddle.org/
 ```