Workbox swDest references are inconsistent

[philipwalton]

Reported on twitter: https://twitter.com/marcushellberg/status/1103827852552736768

@jeffposnick it looks like many of our build tool docs share config partials. I believe workbox-webpack-plugin is the only one that defaults to a particular swDest option. Can you confirm?

If so, any objection to just changing all of our swDest examples to be service-worker.js?

[jeffposnick]

That's correct; only the webpack plugin has a default swDest filename—because webpack can infer the output path. The other build tools need you to provide output info.