so I'm a dummy and left a tracking number as a feedback comment. It's not a big deal since it's still positive feedback, but I would like to have the option to clean it up.

possible solutions: 

limited time frame to edit feedback. 5 minutes would have been enough as I caught my error right away. after that 5 minute window closes, no more editing. 

or

allow feedback changes to be requested, but a mod has to "approve" them before they are accepted. 

I like the first idea as it seems like the mod-approval would be more disruptive.