Man pages matching name plack::middleware::auth::lemonldapng in section 3pm:

Plack::Middleware::Auth::LemonldapNG.3pm.en	debian 10 / liblemonldap-ng-handler-perl
Plack::Middleware::Auth::LemonldapNG.3pm.en	debian 11 / liblemonldap-ng-handler-perl
Plack::Middleware::Auth::LemonldapNG.3pm.en	debian 12 / liblemonldap-ng-handler-perl