With doc/ r50251 (https://svnweb.freebsd.org/doc?view=revision&revision=50251) landed, https://www.FreeBSD.org/handbook/makeworld.html is no longer valid. Could you please create a redirection for this one, or rename the updating-src-building link end back to 'makeworld'?
A commit references this bug: Author: wblock Date: Fri May 26 17:28:29 UTC 2017 New revision: 50288 URL: https://svnweb.freebsd.org/changeset/doc/50288 Log: Edit link IDs so old links will work. Incidentally, split-HTML generation only generates files for top-level sections. PR: 219539 Reported by: delphij Changes: head/en_US.ISO8859-1/books/handbook/cutting-edge/chapter.xml
The HTML-split build now creates a file called makeworld.html. Please let me know of any other problems. Thanks!