instructions for using arbitrary operating systems behind Whonix-Gateway updated

They have been simplified. It is now easier to exactly match the settings of the standard download version.

https://www.whonix.org/wiki/Other_Operating_Systems

Patrick started developing Whonix, the Anonymous Operating System in 2012, when quickly others joined efforts. He collected experiences working pseudonymous on Whonix for two years, enjoys collaboratively working on privacy preserving software.