Identify who is responsible for moving bugs through states

[setharnold]

ubuntu-project-docs/docs/MIR/mir-process-states.md

Line 57 in 1de5afa

| State | Explanation |

Hello, I've seen teammates discussing who should be the one to move bugs through various states, and realized that I am not alone in my confusion. I think the referenced flowchart / list of states could be extended to describe who exactly moves bugs into each state, or out of each state, or maybe even both directions.

Thanks