Automattic/Co-Authors-Plus — pull request #81 by johnbillion (2012-11-11 17:15:41+00:00)
Title: Change the meta box title so it's not specific to Posts

When you're editing Pages or custom post types, the title of the Co-Authors Plus meta box still says 'Post Authors'. It makes more sense just to say 'Authors' so it's post type agnostic.