Webpack Dev Server command deprecated

[Kenludiaz]

Hello,
The command for running webpack dev server on the documentation page is outdated.
Please see webpack/webpack-dev-server#2029 (comment)

It should be webpack serve, not webpack-dev-server --open.

Thank you
[ X] I am willing to work on this issue and submit a pull request.

EDIT: Sorry this command (webpack server)compiled my bundle, but deleted my ./dist files. Will try to find the right command before the documentation is modified.

EDIT: ./dist files deleted, but project is still served. webpack serve seems to still be correct.

[chenxsan]

FYI, we did have a PR here #4091