Suggested edits in Google Docs
Now in Google Docs, any user with “can comment” access to a document will be able to make suggested edits to the document. The suggested edits will appear in the document along with a comment explaining the edit. Those with “can edit” permission will be able to accept or reject those suggested edits. Those with “can view” access will not be able to see suggested edits (until they are accepted). Viewers will also no longer be able to see regular comments, which is a change from today.
Rapid release, with Scheduled release coming soon
Google Drive blog post