Update Documentation to note that hook_civicrm_links objectId could be a string as well as int
ping @eileen @totten FYI when we call this hook from the Extensions page the objectId is actually a string as per the call here https://lab.civicrm.org/seamuslee/dev/-/merge_requests/new?merge_request%5Bsource_branch%5D=links_hook_update and $row['id'] is being set to a string here https://github.com/civicrm/civicrm-core/blob/master/CRM/Admin/Page/Extensions.php#L174