Thanks for contributing to the site and trying to make it a useful tool.
I rejected the edit, because the tones were changed. The question was about pronunciation, and the original poster had explicitly included all the tones, so I thought changing those tones was a significant change to the answer. It was a close call, but I decided to reject.
I did not check to see what the correct tones are, especially since colloquial pronunciation could be different from what I might find in a reference work.
My rule of thumb for approving suggested edits is to approve formatting and spelling changes that are obviously correct. If someone adds some extra information that doesn't look at all controversial, I'll approve that, too.
As for what you could do when you want to correct an answer, here are a few suggestions:
- Add a comment to the answer so the original poster can correct it himself. Other people can also read your comment and see the correction.
- Add a separate answer with the original answer plus your correction. In my opinion, if a change is too significant to be a suggested edit, then it's perfectly acceptable to copy the answer and post a modified version of it as your own. Linking to the original answer to give credit would be polite.
- Post something in the chat room to see if other people agree with your correction. If you get consensus, ask someone with edit privilege to make the correction.
- Wait until you have enough reputation to just make the edit yourself. If you've been around long enough to earn edit privilege, I trust your decision more than mine, because you've spent some time thinking about the question. I'm just looking at the edit and making a quick decision. (Don't you already have enough reputation to make edits?)