add link for 'NNI on Windows' (#2547)

* fix link

* sync release version

Co-authored-by: Lijiao <15910218274@163.com>

README.md

@@ -229,7 +229,7 @@ For detail system requirements of NNI, please refer to [here](https://nni.readth
 Note:
 
 * If there is any privilege issue, add `--user` to install NNI in the user directory.
-* Currently NNI on Windows supports local, remote and pai mode. Anaconda or Miniconda is highly recommended to install NNI on Windows.
+* Currently NNI on Windows supports local, remote and pai mode. Anaconda or Miniconda is highly recommended to install [NNI on Windows](docs/en_US/Tutorial/InstallationWin.md).
 * If there is any error like `Segmentation fault`, please refer to [FAQ](docs/en_US/Tutorial/FAQ.md). For FAQ on Windows, please refer to [NNI on Windows](docs/en_US/Tutorial/InstallationWin.md#faq).
 
 ### **Verify installation**

docs/en_US/_templates/index.html

@@ -251,10 +251,10 @@ <h2 class="second-title">Install</h2>
     <ul>
       <li>If there is any privilege issue, add --user to install NNI in the user directory.</li>
       <li>Currently NNI on Windows supports local, remote and pai mode. Anaconda or Miniconda is highly
-        recommended to install <a href="">NNI on Windows</a>.</li>
+        recommended to install <a href="{{ pathto('Tutorial/InstallationWin') }}">NNI on Windows</a>.</li>
       <li>If there is any error like Segmentation fault, please refer to <a
           href="{{ pathto('Tutorial/Installation') }}">FAQ</a>. For FAQ on Windows, please refer
-        to NNI on Windows.</li>
+        to <a href="{{ pathto('Tutorial/InstallationWin') }}">NNI on Windows</a>.</li>
     </ul>
   </div>
   <div>
@@ -266,7 +266,7 @@ <h2 class="second-title">Verify installation</h2>
     <ul>
       <li>
         <p>Download the examples via clone the source code.</p>
-        <div class="command">git clone -b v1.5 https://github.com/Microsoft/nni.git</div>
+        <div class="command">git clone -b v{{ release }} https://github.com/Microsoft/nni.git</div>
       </li>
       <li>
         <p>Run the MNIST example.</p>