cleaned up code markdowns

docs/Installation-Windows.md

 
 To create a new Conda environment, open a new Anaconda Prompt (_Anaconda Prompt_ in the search bar) and type in the following command:
 
-```conda create -n ml-agents python=3.6```
+```
+conda create -n ml-agents python=3.6
+```
 
 You may be asked to install new packages.  Type `y` and press enter _(make sure you are connected to the internet)_.  You will need to install these packages.  This command will create a new Conda environment called ml-agents using Python version 3.6.