The custom help() is replaced by a COMMAND() description, and
--introspect-cli is added. The odd "Verbs" option group marker is dropped,
so that all options are listed in one section after the verbs, with --help
and --version first. The synopsis now uses the generic "[OPTION…] COMMAND …"
form: a bare VERSION is not accepted as the first argument, and the man
page does not list it either. --help now goes through the pager, like
other commands with --no-pager.