I haven't had opportunity to test this, but can low-rep users approve other users' edits of their own posts?
Example:
- User1 (100 rep) writes a Question or Answer.
- User2 (100 rep) edits User1's post to fix spelling, convert a URL to inline image, and some other cleanup.
Can User1 approve User2's edits, or does User1 have to wait for a higher-rep user to step in?