IMHO, no.

Personally, I only add an EDIT disclaimer if I'm substantially altering the original post. For me that usually means adding additional explanation / context / citations / etc. below the original content. I'd say I rarely change a post in a way that radically alters the meaning of something I already said. But if I do, I'll add an EDIT marker.

I definitely don't bother with that for fixing typos, simple grammatical errors, punctuation, etc.