update doc for v0.3.3 installation tag (#329)

as the title

README.md

@@ -37,16 +37,17 @@ Note: If you are in docker container (as root), please remove `--user` from the
 * We only support Linux (Ubuntu 16.04 or higher) in our current stage. 
 * Run the following commands in an environment that has `python >= 3.5`, `git` and `wget`.
 ```bash	
-    git clone -b v0.3.2 https://github.com/Microsoft/nni.git	
+    git clone -b v0.3.3 https://github.com/Microsoft/nni.git	
     cd nni	
     source install.sh	
 ```
 
 **Verify install**	
-* The following example is an experiment built on TensorFlow. Make sure you have **TensorFlow installed** before running it.	
+
+The following example is an experiment built on TensorFlow. Make sure you have **TensorFlow installed** before running it.	
 * Download the examples via clone the source code.	
 ```bash	
-    git clone -b v0.3.2 https://github.com/Microsoft/nni.git
+    git clone -b v0.3.3 https://github.com/Microsoft/nni.git
 ```
 * Run the mnist example.
 ```bash

docs/GetStarted.md

@@ -18,7 +18,7 @@
 
 * __Install NNI through source code__
    
-      git clone -b v0.3.2 https://github.com/Microsoft/nni.git
+      git clone -b v0.3.3 https://github.com/Microsoft/nni.git
       cd nni
       source install.sh
 

docs/InstallNNI_Ubuntu.md

@@ -16,7 +16,7 @@
 
 * __Install NNI through source code__
    
-      git clone -b v0.3.2 https://github.com/Microsoft/nni.git
+      git clone -b v0.3.3 https://github.com/Microsoft/nni.git
       cd nni
       source install.sh