I forgot about this bug. I've updated this a couple of times, I think. I have instructions somewhere. I'll write up a separate bug for updating it manually this time and we can keep this bug around for figuring out how to automate it.
Bug 1166058 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I forgot about this bug. I think I looked into automating it and it was tough for some reason, but I don't remember what that was. I'll toss it in the queue.