fix typos in Caching section
fix typos in Caching section
martinthomson/ServiceWorker,karolklp/ServiceWorker,zuzusik/ServiceWorker,justinleoye/ServiceWorker,mkruisselbrink/ServiceWorker,chadoliver/ServiceWorker,zuzusik/ServiceWorker,karolklp/ServiceWorker,karolklp/ServiceWorker,slightlyoff/ServiceWorker,martinthomson/ServiceWorker,martinthomson/ServiceWorker,mkruisselbrink/ServiceWorker,slightlyoff/ServiceWorker,justinleoye/ServiceWorker,justinleoye/ServiceWorker,zuzusik/ServiceWorker,chadoliver/ServiceWorker,chadoliver/ServiceWorker