Addexplanation about the registration's lifetime upon unregister
Addexplanation about the registration's lifetime upon unregister

justinleoye/ServiceWorker,chadoliver/ServiceWorker,mkruisselbrink/ServiceWorker,karolklp/ServiceWorker,martinthomson/ServiceWorker,zuzusik/ServiceWorker,martinthomson/ServiceWorker,karolklp/ServiceWorker,mkruisselbrink/ServiceWorker,karolklp/ServiceWorker,justinleoye/ServiceWorker,slightlyoff/ServiceWorker,chadoliver/ServiceWorker,zuzusik/ServiceWorker,slightlyoff/ServiceWorker,zuzusik/ServiceWorker,martinthomson/ServiceWorker,justinleoye/ServiceWorker,chadoliver/ServiceWorker