c2k15: Internal jump targets to help navigating big manual pages

One of our favorite developers Ingo Schwarze (schwarze@) writes in about a new feature that he just added to mandoc(1).

Did you ever look at a huge page in man(1), wanted to jump to the definition of a specific term - say, in ksh(1), to the definition of the "command" built-in command - and had to step through dozens of false positives with the less '/' and 'n' search keys before you finally found the actual definition?