I was going to add an exception, but I'm not going to do that.

I decided I'd leave this here, anyway. It seems useful.
Tell 'editor' users that they can't modify 'admin' users.

If an 'editor' tries to view the Edit User page for an 'admin', they'll get a
401 error. I also added a view and template for 401 errors specifically, since I
think this is the only way for one to be raised at this point.