docs: fix wrong filename in text (angular#28832)

This should be `ngsw.json` not `ngsw-config.json` as the latter is only the src file that gets then compiled into the `ngsw.json` and placed into the `dist` folder
PR Close angular#28832

Author: juristr

aio/content/guide/service-worker-devops.md

@@ -301,7 +301,7 @@ an administrator ever needs to deactivate the service worker quickly.
 ### Fail-safe
 
 To deactivate the service worker, remove or rename the
-`ngsw-config.json` file. When the service worker's request
+`ngsw.json` file. When the service worker's request
 for `ngsw.json` returns a `404`, then the service worker
 removes all of its caches and de-registers itself,
 essentially self-destructing.