Man pages matching name www::youtube::download in section 3pm:

WWW::YouTube::Download.3pm.en	debian 10 / libwww-youtube-download-perl
WWW::YouTube::Download.3pm.en	debian 11 / libwww-youtube-download-perl
WWW::YouTube::Download.3pm.en	debian 12 / libwww-youtube-download-perl