It's easy, all you have to do is to follow this link to the GNATS database, find a PR, figure out what needs done and do it.
If you are a committer, you can use the edit-pr command 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.
These graphs are generated by a couple of Tcl Scripts.
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