xwiki.cfg points at the old Short URLs documentation page

  #-# The fallback servlet mapping name to use in the generated URLs. Unlike xwiki.servletpath, this is the value used
  #-# when the correct setting could not be determined from the request URL. A good way to use this setting is to achieve
  #-# short URLs, see https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/ShortURLs/
  # xwiki.defaultservletpath=bin/