Fix a typo in Chunk#split jsdoc comment

[DeTeam]

What kind of change does this PR introduce?

typo fix

Does this PR introduce a breaking change?

no

What needs to be documented once your changes are merged?

nothing

[webpack-bot]

For maintainers only:

• This need to be documented (issue in webpack/webpack.js.org will be filed when merged)

[DeTeam]

@TheLarkInn please have a look when you have a moment

[webpack-bot]

Thank you for your pull request! The most important CI builds succeeded, we’ll review the pull request soon.

[DeTeam]

It's a bit strange that webpack.webpack failed. Should I rebase or maybe re-trigger the build?

[DeTeam]

Thanks @ooflorent
Does it mean we can merge this tiny fix now? :)

[sokra]

Thanks