Per mara's review: "describe what is, not what is not."
The header said "the swarm services' vhosts are NOT here", which
describes the file by its absences and dates immediately — the list of
what is missing grows every time a service is added, while the list of
what the file holds does not.
Reworded to say what it is: the hive's own gateway surface (the `_`
default server and the vhost named for the hive domain), with the scope
line stating where a swarm service's vhost lives rather than where it
doesn't.
3be7a211d0