This manual page documents briefly the pdftohtml command. This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page.
That is outdated though, at least my current release version of poppler (0.57.0) has a manpage for pdftohtml which says at the end "This manual page was written by Søren Boll Overgaard <boll@debian.org>, for the Debian GNU/Linux system (but may be used by others).". According to the current poppler PKGBUILD in Extra[0], there are no patches applied.
Edit: Actually, poppler has had the pdftohtml manpage upstream since version 0.5.0, which was released 2006-01-11. The last release of poppler without a pdftohtml manpage was 0.4.0, released on 2005-08-07. How on earth are you running a twelve year old version of poppler? Or does Debian/Ubuntu still overwrite the upstream version of that manpage?