* Docs: Define TLS/SSL terminology

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Apply suggestions from code review

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

* Change title

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Move terminology.md

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>