I expect you're talking about this comment. It was me who edited it: because, if I recall correctly your comment invited the OP (lewis) to post in meta about their question being closed: however with only "1 rep" they're actually not allowed to post in meta (which could be frustrating for them). Given that your comment was trying to help the new OP, rather than post another comment to contradict yours I though it better to lightly edit your comment, to invite them to read meta without inviting them to post.
Sorry for the confusion; I hope I didn't change your intent.
It is true that moderators can edit comments. Occasionally in the past I might have edited someone else's comment to replace a raw http:\\example.com link with the more useful [Article title](http:\\example.com) equivalent.
One more thing is that users can edit their own comments for only the first five minutes after posting it but moderators have no time limit. So I'll sometimes edit my own comments later, for example today I edited this comment to condense and tidy up a previous day's (imo now-obsolete) comment thread.
Thank you for asking; and do tell me if I do something as a moderator which you think I shouldn't.
On rereading the comment I see that once I started to edit it I also went on and added suggestions of how to fix (or re-ask) the question, based on (i.e. trying to summarize) what other people (i.e. not you) had suggested in the corresponding meta-thread. Sorry about that. I'll try not to do that again.