docs: update filename placeholders link and description

[chenjiahan]

Summary

Update documentation to use consistent terminology "filename placeholders" instead of "template strings". Also update related links and tips to reflect this terminology change.

Related Links

https://rspack.rs/config/filename-placeholders

Checklist

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

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[Copilot]

Pull request overview

This PR updates documentation terminology from "template strings" to "filename placeholders" to ensure consistency across the Rsbuild documentation. The changes also update related links to point to the new Rspack filename placeholders documentation page.

• Replaces all occurrences of "template strings" (and Chinese equivalent "模板字符串") with "filename placeholders" ("文件名占位符")
• Updates links from rspack.rs/config/output#template-string to rspack.rs/config/filename-placeholders
• Maintains consistency between English and Chinese documentation versions

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
website/docs/en/config/output/filename.mdx	Updates English documentation to use "filename placeholders" terminology and corrects the reference link
website/docs/zh/config/output/filename.mdx	Updates Chinese documentation to use "文件名占位符" terminology and corrects the reference link

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