Wrong documentation for output.externals type

[dilyanpalauzov]

https://webpack.js.org/configuration/externals/#externals says:

type: string | [string] | object | function | RegExp

The array can contain both functions, strings, and RegExps, as described at https://webpack.js.org/configuration/externals/#combining-syntaxes .

The above type definition of externals shall be updated to state, that external accepts an array, and that array can have string, function, Regexp, or object.

[snitin315]

I will update