docs: improve Rspack configuration examples

[chenjiahan]

Summary

Add more detailed examples for registering both built-in Rspack plugins and community webpack plugins.

Related Links

• [Feature]: Add support for CircularDependencyRspackPlugin #6705

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull request overview

This PR improves the Rspack configuration documentation by replacing a single generic example with three more detailed, concrete examples showing different ways to configure Rspack plugins.

• Adds an example for registering a built-in Rspack plugin (CircularDependencyRspackPlugin)
• Adds an example for registering a community webpack plugin (sentryWebpackPlugin)
• Clarifies that the function form modifies the "built-in" Rspack config

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
website/docs/en/guide/configuration/rspack.mdx	Splits single plugin example into three detailed examples with imports and proper context
website/docs/zh/guide/configuration/rspack.mdx	Chinese translation of the same documentation improvements

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