small edits

docs/Readme.md

 * [Installation](Installation.md)
   * [Background: Jupyter Notebooks](Background-Jupyter.md)
   * [Docker Set-up](Using-Docker.md)
-  * [Using Python Virtual Environment](Using-Virtual-Environment.md) 
+  * [Using Virtual Environment](Using-Virtual-Environment.md) 
 * [Basic Guide](Basic-Guide.md)
 
 ## Getting Started

docs/Using-Virtual-Environment.md

 # Using Virtual Environment
 
 ## What is a Virtual Environment?
-A Python Virtual Environment is an isolated workspace for Python projects. 
+A Virtual Environment is a walled garden for Python projects.  
-of other projects. This has two advantages:
+of other projects. This has a few advantages:
-Requirement - Python 3.6 must be installed on the installed on the machine you would like 
+Requirement - Python 3.6 must be installed on the machine you would like 
 to run ML-Agents on (either local laptop/desktop or remote server). Python 3.6 can be 
 installed from [here](https://www.python.org/downloads/).