Go fix/close a PR!
It’s easy, all you have to do is to follow this link to the Bugzilla database, find a PR, figure out what needs done and do it.
If you are a committer, you can use the web interface to close PRs.
If you are not a committer, you should submit a followup containing the text :
This PR can be closed
on a line of its own, that will make it easier for a committer to deal with it later.