example config missing from docs

[timwebster9]

if a config file for a test isn't named jenkins.config it is excluded from the auto-generated docs (for example, the JNLP config). I think because of this: https://github.com/buildit/jenkins-startup-scripts/blob/6a95ec5b882cc50cb61adf43380c95fea25ea4f5/docs.gradle#L49

Actually it might be good to have a naming convention to exclude test configs we don't want to show, so as not to confuse the reader.

[timja]

Adding an _ or a . would probably be enough to be a 'private' config that doesn't go in the docs