Hi @taylord2 and welcome to the Community. Currently you can delete but not edit this comments. However, what I frequently do is copy the comment, paste it in Word, delete the comment with an error, fix the comment and then post a new comment by copy/paste. For short comments I skip the part about posting in Word. With longer comments I just fear somehow the copy didn't work!
It goes fast (perhaps this is why it hasn't been changed yet) and I have "edited" many comments this way over time. Being said, there is an open idea for editing these comments, https://community.canvaslms.com/ideas/12956-feedback-box-in-speedgrader-needs-to-be-editable" modifi.... I have voted for this and suggest you consider doing so as well!
Hope this helps---
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