With an open source tracker, anyone could offer their solution to "issue no. 23: Code of Conduct doesn't mention Disinfo" with some proposed new language for the CoC to cover that.
It's a bit like Track Changes in a Word processing doc where it's clear what you are suggesting to delete or add. Just the same the PR/MR can be approved or rejected – but this is by the Maintainers. This is why, unless it's fixing a typo, they often don't merge until there's been some discussion & consensus formed…