lowercase mono-complete package name

Author: faviocb

GettingStartedDeb.md

@@ -25,7 +25,7 @@ To get these builds you need to run:
 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
 sudo apt-get update
-sudo apt-get install Mono-Complete
+sudo apt-get install mono-complete
 ```
 
 ### Get libuv