Moderators might know whether you’ve edited your post. Most regular users won’t.
As to why they would care:
Imagine that you make a comment:
“I just found out about blue whales, such amazing fish!”
And someone replies to you:
“Whales aren’t fish, they’re mammals.”
And then you edit your comment to say,
“I just found out about blue whales, such amazing mammals!”
If you don’t say that you’ve edited your post and why, the person who replied to you now looks like an auto-correct bot at best, or an absolute idiot at worst.
So it’s just a bit of etiquette so as to not make your fellow posters look foolish when you were the one who was incorrect to begin with.
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