Man pages matching name rt::extension::smsnotify::pagerforuser in section 3pm:

RT::Extension::SMSNotify::PagerForUser.3pm.en	debian 10 / rt4-extension-smsnotify
RT::Extension::SMSNotify::PagerForUser.3pm.en	debian 11 / rt4-extension-smsnotify
RT::Extension::SMSNotify::PagerForUser.3pm.en	debian 12 / rt4-extension-smsnotify