That's assuming a lot about the work environment.
If your have a team full of professionals, trusted by stakeholders then you don't need any of that.
If my teammember decides documentation needs updating he should go ahead and update it. Tickets and PRs are for thing that need planning and reviewing. I trust my colleagues to know when that is the case and decide accordingly. If any of us messes up we talk about it and improve.
In reality this means that many, if not most, things still get tickets / PRs because it helps but the fact that it's not simple ceremony makes sure everyone knows their importance and saves time when they aren't needed.
If my teammember decides documentation needs updating he should go ahead and update it. Tickets and PRs are for thing that need planning and reviewing. I trust my colleagues to know when that is the case and decide accordingly. If any of us messes up we talk about it and improve.
In reality this means that many, if not most, things still get tickets / PRs because it helps but the fact that it's not simple ceremony makes sure everyone knows their importance and saves time when they aren't needed.