There are some docs ( at 11.04.2001 avaible docs for html, css, php, javascript ) you need to download packages from http://quanta.sourceforge.net ( html.tar.bz2, php.tar.bz2, css.tar.bz2 ) and uncompress them to $KDEDIR/share/apps/quanta/doc/ or to ~/.trinity/share/apps/quanta/doc/ and restart quanta.