mara: "deploy.nix still says it everywhere". Seven option descriptions
each told the reader that this service derives from the swarm-services
switch — the same duplication just removed from docs/swarm/services.md,
one layer over, and rendered into the generated options doc.
Each keeps only what is true of that service and nothing else: the
metrics store is paired with grafana, the log store has clients rather
than second instances, the homeserver can be placed on its own host, a
swarm has one SSO provider. The store's paragraph about where it runs
being a separate question from that it runs survives, because that is
about the store, not about the switch.
swarm-ui keeps its positive derivation (the controller) and loses only
the "rather than from allSwarmServices" half.
Deliberately not touched, as a different question rather than an
oversight: the *mode* option's description in local-defaults.nix, whose
whole job is to name what it asserts; the module comments in
swarm-authelia.nix / swarm.nix, which are read by someone editing that
module rather than by an operator picking an option; and ui.md's
contrast, which she has not ruled on.