docs(cache-valkey): 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.
(component.go doc comment corrected too.)

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

@@ -4,8 +4,9 @@
 // # Quick start
 //
 //	vk := cachevalkey.New(logger, cfg)
-//	launcher.Register(vk) // lifecycle: OnInit → OnStart → OnStop
-//	health.Register(vk)   // health: PING-based, LevelDegraded
+//	lc.Append(vk) // lifecycle: OnInit → OnStart → OnStop
+//	// vk satisfies observability.Checkable (PING-based, LevelDegraded) — wire a health endpoint:
+//	srv.Get("/health", health.NewHandler(logger, vk).ServeHTTP)
 //
 // # Adapters
 //