Update PWA docs to point at the cra-template-pwa package (facebook#10805)

Author: slieschke

Diff for: docusaurus/docs/making-a-progressive-web-app.md

@@ -39,14 +39,14 @@ case.
 In addition to creating your local `src/service-worker.js` file, it needs to be
 registered before it will be used. In order to opt-in to the offline-first
 behavior, developers should look for the following in their
-[`src/index.js`](https://github.com/facebook/create-react-app/blob/master/packages/cra-template/template/src/index.js)
+[`src/index.js`](https://github.com/cra-template/pwa/blob/master/packages/cra-template-pwa/template/src/index.js)
 file:
 
 ```js
 // If you want your app to work offline and load faster, you can change
 // unregister() to register() below. Note this comes with some pitfalls.
 // Learn more about service workers: https://cra.link/PWA
-serviceWorker.unregister();
+serviceWorkerRegistration.unregister();
 ```
 
 As the comment states, switching `serviceWorker.unregister()` to
@@ -82,7 +82,7 @@ or unreliable network.
 
 Note: Resources that are not generated by `webpack`, such as static files that are
 copied over from your local
-[`public/` directory](https://github.com/facebook/create-react-app/blob/master/packages/cra-template/template/public/)
+[`public/` directory](https://github.com/cra-template/pwa/tree/master/packages/cra-template-pwa/template/public/)
 or third-party resources, will not be precached. You can optionally set up Workbox
 [routes](https://developers.google.com/web/tools/workbox/guides/route-requests)
 to apply the runtime caching strategy of your choice to those resources.
@@ -128,7 +128,7 @@ following into account:
    fetched the latest updates that will be available the next time they load the
    page (showing a "New content is available once existing tabs are closed." message). Showing
    these messages is currently left as an exercise to the developer, but as a
-   starting point, you can make use of the logic included in [`src/serviceWorker.js`](https://github.com/facebook/create-react-app/blob/master/packages/cra-template/template/src/serviceWorker.js), which
+   starting point, you can make use of the logic included in [`src/serviceWorkerRegistration.js`](https://github.com/cra-template/pwa/blob/master/packages/cra-template-pwa/template/src/serviceWorkerRegistration.js), which
    demonstrates which service worker lifecycle events to listen for to detect each
    scenario, and which as a default, only logs appropriate messages to the
    JavaScript console.
@@ -160,11 +160,11 @@ following into account:
 ## Progressive Web App Metadata
 
 The default configuration includes a web app manifest located at
-[`public/manifest.json`](https://github.com/facebook/create-react-app/blob/master/packages/cra-template/template/public/manifest.json), that you can customize with
+[`public/manifest.json`](https://github.com/cra-template/pwa/blob/master/packages/cra-template-pwa/template/public/manifest.json), that you can customize with
 details specific to your web application.
 
 When a user adds a web app to their homescreen using Chrome or Firefox on
-Android, the metadata in [`manifest.json`](https://github.com/facebook/create-react-app/blob/master/packages/cra-template/template/public/manifest.json) determines what
+Android, the metadata in [`manifest.json`](https://github.com/cra-template/pwa/blob/master/packages/cra-template-pwa/template/public/manifest.json) determines what
 icons, names, and branding colors to use when the web app is displayed.
 [The Web App Manifest guide](https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/)
 provides more context about what each field means, and how your customizations