docs(arr): correct the subtitle lane's comment

Said translation backends are passed empty; #216 wired them and #219 made
both callers share one set.

crates/arr-daemon/src/main.rs

@@ -525,10 +525,12 @@ fn jellyfin_client(config: &Config) -> Result<arr_api::jellyfin::JellyfinClient,
 
 /// The §15 reconcile lane: closes subtitle gaps from the attempt rows.
 ///
-/// Translation backends are passed empty: none is constructed at startup yet
-/// — the compiled-in backends (#191–#193) still need their bootstrap wiring
-/// (model names, base URLs) — so the translate step records "not compiled"
-/// and backs off rather than failing obscurely.
+/// Takes the same [`Translators`] the API is given, built once at startup, so
+/// a translation behaves identically whether the reconcile sweep or the manual
+/// endpoint asked for it. Which of the offered backends actually runs is the
+/// `translation_engine` database setting, read per translation; with none
+/// compiled in the translate step records "not compiled" and backs off rather
+/// than failing obscurely.
 fn subtitle_action(
     config: &Config,
     notifier: &Notifier,