Man pages matching name net::ldap::extension::whoami in section 3pm:

Net::LDAP::Extension::WhoAmI.3pm.en	debian 10 / libnet-ldap-perl
Net::LDAP::Extension::WhoAmI.3pm.en	debian 11 / libnet-ldap-perl
Net::LDAP::Extension::WhoAmI.3pm.en	debian 12 / libnet-ldap-perl