Wiki link in OG Sync module description gives a 404
https://civicrm.stackexchange.com/questions/34207/civicrm-og-sync-documentation
drupal/modules/civicrm_og_sync/civicrm_og_sync.info has a link to http://wiki.civicrm.org/confluence/display/CRMDOC/CiviCRM+vs.+Organic+Groups
Should be https://docs.civicrm.org/sysadmin/en/latest/integration/drupal/#civicrm-organic-groups-sync
I can do a PR.