Update index_en.rst (#9280)

* Update index_en.rst

* Update index_en.rst

Update  refer to commits

doc/v2/howto/index_en.rst

@@ -1,11 +1,37 @@
 HOW TO
-=======
+========
+
+PaddlePaddle provides the users the ability to flexibly set various command line parameters to control the model training and inference process. Please refer to the following instructions on using PaddlePaddle:
+
+..  toctree::
+  :maxdepth: 1
+
+  cmd_parameter/index_cn.rst
+
+PaddlePaddle supports distributed training tasks on fabric clusters, MPI clusters, and Kubernetes clusters. For detailed configuration and usage instructions, refer to:
+
+..  toctree::
+  :maxdepth: 1
+
+  cluster/index_cn.rst
+
+PaddlePaddle provides a C-API for inference. We provide the following guidelines  for using the C-API:
+
+..  toctree::
+  :maxdepth: 1
+
+  capi/index_cn.rst
+
+PaddlePaddle supports a variety of flexible and efficient recurrent neural networks. For details, please refer to：
+
+..  toctree::
+  :maxdepth: 1
+
+  rnn/index_cn.rst
+
+How to use the built-in timing tool, nvprof, or nvvp to run performance analysis and tuning, please refer to：
 
 ..  toctree::
   :maxdepth: 1
 
-  cmd_parameter/index_en.rst
-  cluster/index_en.rst
-  capi/index_en.rst
-  rnn/index_en.rst
-  optimization/gpu_profiling_en.rst
+  optimization/gpu_profiling_cn.rst