When I start an edit on SO, I see this box:
You do not have edit privileges. Your edit will be placed in a queue until it is peer reviewed.
We welcome all constructive edits, but please make them substantial. Avoid trivial, tiny one-letter edits unless absolutely necessary.
I bolded the relevant part, because it conflicts with the following message:
Oops! Your edit couldn't be submitted because:
•Edits must be at least 6 characters; is there something else to improve in this post?
Nothing major, but the first message implies something that the second denies.