docs(api): update commands

[snitin315]

To be merged after the new webpack-cli release.

Refers - webpack/webpack-cli#2303 webpack/webpack-cli#2357

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[chenxsan]

Let's convert it into draft, and set it ready for review when a new version webpack-cli including this feature is released.

[snitin315]

The new webpack-cli version is released 🚀

[alexander-akait]

Also we have watch (alias --watch) and build commands (alias bundle, b, or without command - webpack --entry ./file.js)

[snitin315]

#4450