Reference to missing functions (book_pick_book_submit()

we have the following comment in the code:

/**
 * Implementation of hook_form_alter(). Adds the book fieldset to the node form.
 *
 * @see book_pick_book_submit()
 * @see book_submit()
 */
function book_form_alter(&$form, $form_state, $form_id) {

the problem is that neither book_pick_book_submit() nor book_submit() seem to exist.

The references were added in revision 1.429, as part of pwolanin's mega book patch, but removed with this issue: http://drupal.org/node/160039

It may not be enough to remove the two lines of comment. Maybe the documentation that was part of the removed issues should be put back instead.