Update instructions of drupal-8.2.7 links to update instructions for Drupal core 7.

The update instructions on the release page of drupal-8.2.7 links to update instructions for Drupal core 7.

To clarify:
The update instructions link on following page (https://www.drupal.org/project/drupal/releases/8.2.7) links to https://www.drupal.org/node/1223018 instead of https://www.drupal.org/docs/8/update/update-procedure-in-drupal-8


Source: https://www.drupal.org/project/issues/rss/documentation