update: service worker docs

[benschac]

users need to write dist to disk in order to user http-server
https://stackoverflow.com/questions/41928358/webpack-how-to-compile-write-on-disk-and-serve-static-content-js-css-using-w/41928812#41928812
and
https://github.com/webpack/webpack-dev-server/releases/tag/v3.1.10

in favor of #3089

[jsf-clabot]

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[montogeek]

Why opening a new PR instead of updating the previous one?

[benschac]

I should have posted in the other PR. I was failing linting in the last one. The other PR was made with the github edit feature. I wanted to pull down the project and make sure I didn't fail linting again.

[benschac]

I signed CLI's from both CLI's shold I just rebase with one commit from one account? Sorry about this.

[benschac]

Is travis down? It's been hanging all day :(

[EugeneHlushko]

I think this is a good catch, although there is no need to duplicate examples of configs over the docs. Lets link to existing ones. Also changed the name of DevServer to be consistent with documentation.

If no objection please commit suggestion and remove the webpack.config.js.... example so that it will be good to merge

[benschacprolific]

I think everything is passing on my end and I updated the PR with your feedback. Lmk if there's anything else you need on my end.

Thanks again.

[montogeek]

@EugeneHlushko Please re review

[benschacprolific]

anything else that needs to get updated on my end?

[montogeek]

No, thanks!