Clean up comments regarding work done by stochastic forcing

[navidcy]

The code is sprinkled with comments about how one should implement the work done by stochastic forcing in Ito or Stratonovich interpretation. We should remove all those comments, as they read a bit out of context. Instead we should make sure that discussion on forcing in the Docs is clear and include in that discussion an example of work implemented via Ito or via Stratonovich calculus.