Description of problem:
Documentation about the different SSL certificates used in Satellite is outdated. The best source of information on this topic seems to be this old KCS Article [1] written for Satellite 6.2. 

This RFE suggests documenting the list of SSL certificates used in recent versions of Satellite, along with a brief description (just like it was done at the time for 6.2).

Ideally this would be provided as official documentation, so it would be maintained over time, but another KCS article could also be an option if needed.

Target persona:
This would help support engineers, TAMs and customers willing to understand what a specific certificate is used for (eg. useful during troubleshooting when finding references of a certificate in a log file and trying to understand the role that certificate plays).

[1]: https://access.redhat.com/articles/3290001