As far as I can tell these pages relate to a plugin for mod_assignment. Mod_assignment was removed in Moodle 4.2 (MDL-72350):

1. https://docs.moodle.org/404/en/mod/assignment/type/peerreview/analysis
2. https://docs.moodle.org/404/en/mod/assignment/type/peerreview/massMark
3. https://docs.moodle.org/404/en/mod/assignment/type/peerreview/criteria

It looks like the plugin's main page was deleted in 2011, presumably the above should all be deleted too.

(I don't think contributors can delete pages, thus I'm logging it here).