Provide option to disable token macro parsing in description files

My markdown description files have many references to environment variables with backticks around them (as it explains the jenkins job scripts themselves, which use environment variables).

While I'm sure I could ask devs to escape any comments they make, it's confusing to have a build fail for something in the meta-docs. It would be great if I could just disable token macro parsing at global- or job-level.

Thanks!