Define Style Rules for Referencing Issues in Comments

Summary

In reviewing changes to URLs found in comments in RTEMS, I noticed that it is impossible to tell if most of them are there to say there is an issue with the following code described in ticket X. Or if this is a reference to an issue which provides more information on a fixed problem and helps understand what's there.

But a comment that just cites a URL to an issue is lacking. We just need to define what we want when a ticket is referenced about an open or closed issue.

Steps to reproduce

Just grep for https in RTEMS. :)