fix: Fix type checking in config examples

[danielkoller]

Hello there!

Thanks for rspack!

Just a quick PR to fix the type checking in the configuration file examples you have, similar to the config page.

It was already discussed and merged here.

The underlying TypeScript problem is found here.

Thanks to @karlhorky for letting me take this over.

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[hyf0]

Thank you! I've changed rspack.config.js of my Rspack template following this PR :).