A pull request by@alexander-akait was merged and maintainers requested a documentation change.

See pull request:webpack/webpack#18965

What kind of change does this PR introduce?

fixeswebpack/webpack#18898

Did you add tests for your changes?

WIP

Does this PR introduce a breaking change?

No

What needs to be documented once your changes are merged?

Now we export the pluginMergeDuplicateChunksPlugin, so developers can now use it with any stage and merge chunks afterhttps://webpack.js.org/plugins/split-chunks-plugin/.

There is only one option -stage.