What does this MR do?
Improves the documentation surrounding graceful shutdown.
Why was this MR needed?
Are there points in the code the reviewer needs to double check?
Does this MR meet the acceptance criteria?
Added for this feature/bug
All builds are passing
Branch has no merge conflicts with
master(if you do - rebase it please)
What are the relevant issue numbers?
Closes #1793 (closed)