API page: https://api.drupal.org/api/drupal/modules%21node%21node.api.php/function...
Sentence that is in the title here is very misleading as:
Returning FALSE will NOT break any other node access modules. It will just have priority over others 'yes'.
A better or proper sentence would be:
'Blindly returning FALSE will cause other node access modules 'yes' being ineffective as if anyone says FALSE than the overall result is FALSE. In other words FALSE has priority to TRUE.'
Or even not saying anything is fine as it has been explained earlier, this is kind of a note.
BETA: This is an unfrozen documentation-only change.