Document OpenJDK s2i image usage

There appears to be no modern documentation for the certified Java S2I images. The last time this was documented is in an orphaned doc related to OpenShift 3.6:

https://access.redhat.com/documentation/en-us/red_hat_jboss_middleware_for_openshift/3/html-single/red_hat_java_s2i_for_openshift/index

But it's out of date, and not navigable from docs.redhat.com - I found it through Google. There is also an old bug filed OSDOCS-284 but no movement on that for almost 2 years.

ezeaguilar is there someone in engineering or otherwise that the docs team can work with to get updated Java S2I docs (environment variables, command line switches, feature docs, etc)? I think this would benefit a great number of community members and customers that use these images extensively.