modify some sentences

Author: shanyi15

doc/v2/faq/index_en.rst

@@ -1,7 +1,7 @@
 FAQ
 ====
 
-This document provides answers to some of the frequently asked questions about PaddlePaddle. If you have a question that is not covered here, please go to `PaddlePaddle Community <https://github.com/PaddlePaddle/Paddle/issues>`_ , to find answers or open an `issue <https://github.com/PaddlePaddle/Paddle/issues/new>`_  , we will reply in time.
+This document provides answers to some of the frequently asked questions about PaddlePaddle. If you have a question that is not covered here, please go to `PaddlePaddle Community <https://github.com/PaddlePaddle/Paddle/issues>`_ , to find an answer or submit new `issue <https://github.com/PaddlePaddle/Paddle/issues/new>`_  , we will reply in time.
 
 ..  toctree::
   :maxdepth: 1