Update dependency-extraction-webpack-plugin docs

[enodekciw]

requestToHandle is example is wrong. It shows requestToExternal being passed into the plugin, but function name is different.

What?

Fixes an example code for requestToHandle

[github-actions]

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[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @enodekciw! In case you missed it, we'd love to have you join us in our Slack community.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[Mamaduka]

Thank you, @enodekciw!

[github-actions]

Congratulations on your first merged pull request, @enodekciw! We'd like to credit you for your contribution in the post announcing the next WordPress release, but we can't find a WordPress.org profile associated with your GitHub account. When you have a moment, visit the following URL and click "link your GitHub account" under "GitHub Username" to link your accounts:

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