If eZ publish is installed with non virtualhost setup you should get access to the documentation with the url:
http://localhost/index.php/user/manual/
or http://localhost/index.php/admin/manual/
The siteaccess for the manual seems to be missing, so go to your 'ezpublish_dir/settings/siteaccess' directory, copy the 'sdk' directory to 'manual', edit 'manual/site.ini.append' and replace the two places where it says '/sdk' with '/manual' (without the '). Now you should be able to view the manual at http://localhost/index.php/manual