Certainly polite but a bit jarring as a non-native speaker that feels fluent. Also a bit nonsensically-bureaucratic : I made the mistake because I didn't know any better, after the comment I still couldn't correct the mistake because I still didn't know any better, I wasn't even sure what rule of punctuation I had wronged.
I would've preferred a direct edit instead of a comment prompting though I guess that can be seen as worse by some people.
Maybe you put a space before a colon, and the eagle-eyed moderator spotted it :-)
(English rarely has a space before a punctuation mark — except for a dash in British usage. Americans—I think—do this.)