Assuming that the suggested edit is good enough that you would consider accepting it, based on its own merits, and ignoring the comment, here’s a possible approach:

The first time you see something like this:

1. Accept the edit (or improve it).
2. Leave a comment for the editor asking him to write better comments.  (You can @-ping people who have (successfully) edited a post.  But you’ll have to type (or copy and paste) the user’s name, because it isn’t included in the auto-complete.  And this doesn’t work at all for users who have suggested edits that were rejected.)
3. Make a note of the user name.

Then, when you more low-quality edit comments coming from the same users, reject them.

Assuming that the suggested edit is good enough that you would consider accepting it, based on its own merits, and ignoring the comment, here’s a possible approach:

The first time you see something like this:

1. Accept the edit (or improve it).
2. Leave a comment for the editor asking him to write better comments.  (You can @-ping people who have (successfully) edited a post.  But you’ll have to type (or copy and paste) the user’s name, because it isn’t included in the auto-complete.  And this doesn’t work at all for users who have suggested edits that were rejected.)
3. Make a note of the user name.

Then, when you see more low-quality edit comments coming from the same users, reject them.