docs(worker): fix fictional launcher.Register/health.Register in doc examples

The package-doc examples showed a fictional launcher.Register / health.Register
API (and launcher.Append as a package func). Corrected to the real wiring:
lc.Append + web/health.NewHandler(...).ServeHTTP.
worker exposes lc.Append only — it is not observability.Checkable, so no health hook.

Documentation-only. No code, API, or dependency changes; version stays v1.1.0
(the v1.1.0 tag is moved to include this fix). Verified by compiling the
corrected pattern against the real API.

doc.go

@@ -9,10 +9,10 @@
 //     ShutdownTimeout for all goroutines to finish. Returns nil regardless of
 //     whether the drain completed before the deadline.
 //
-// Register with the launcher before starting:
+// Append to a launcher before starting:
 //
 //	pool := worker.New(logger, cfg)
-//	launcher.Register(pool)
+//	lc.Append(pool)
 //
 // # Dispatching Tasks
 //