docs(guides): change CleanWebpackPlugin arguments usage (#2845)

* docs: change CleanWebpackPlugin arguments usage

CleanWebpackPlugin released  v2.0.0 and the API has a breaking change: No configuration is needed for standard usage (cleans webpack's output.path).

* Update src/content/guides/output-management.md

Co-Authored-By: Ivocin <[email protected]>

* Update src/content/guides/output-management.md

Co-Authored-By: Ivocin <[email protected]>

* add `+` in diff code block new line

Author: Ivocin

src/content/guides/output-management.md

@@ -194,7 +194,8 @@ __webpack.config.js__
       print: './src/print.js'
     },
     plugins: [
-+     new CleanWebpackPlugin(['dist/*']),
++     // new CleanWebpackPlugin(['dist/*']) for < v2 versions of CleanWebpackPlugin
++     new CleanWebpackPlugin(),
       new HtmlWebpackPlugin({
         title: 'Output Management'
       })