The main API reference page of Drupal 7 at http://api.drupal.org/api/7 has two links ("Constants" and "Global variables") that link to D6 documentation.
They point to http://api.drupal.org/api/constants and http://api.drupal.org/api/globals even though http://api.drupal.org/api/constants/7 and http://api.drupal.org/api/globals/7 exist.
Comments
Comment #1
drummCommitted a fix, should be live within 40 minutes.