docs: optimize source.exclude description (#1009)

Author: Timeless0911

website/docs/en/config/rsbuild/source.mdx

@@ -48,7 +48,18 @@ Check out the [lib.bundle](/config/lib/bundle#set-entry) to learn more about how
 
 ## source.exclude <RsbuildDocBadge path="/config/source/exclude" text="source.exclude" />
 
-Specifies JavaScript/TypeScript files that do not need to be compiled.
+Exclude JavaScript or TypeScript files that do not need to be transformed by [SWC](https://rsbuild.dev/guide/configuration/swc).
+
+::: note
+
+Files configured in `source.exclude` will not be transformed by SWC, but the referenced files will still be bundled into the outputs.
+
+If you want certain files not to be bundled into the outputs, you can use the following methods:
+
+- **bundle mode**: Use Rspack's [IgnorePlugin](https://rspack.dev/plugins/webpack/ignore-plugin).
+- **bundleless mode**: Use `source.entry` to configure the corresponding glob expression, refer to [Set entry](/config/lib/bundle#bundle-false).
+
+:::
 
 ## source.include <RsbuildDocBadge path="/config/source/include" text="source.include" />
 

website/docs/zh/config/rsbuild/source.mdx

@@ -47,7 +47,18 @@ const defaultEntry = {
 
 ## source.exclude <RsbuildDocBadge path="/config/source/exclude" text="source.exclude" />
 
-指定不需要编译的 JavaScript/TypeScript 文件。
+排除不需要被 [SWC](https://rsbuild.dev/zh/guide/configuration/swc) 转译的 JavaScript 或 TypeScript 文件。
+
+::: note
+
+在 `source.exclude` 中配置的文件不会经过 SWC 转译，但被引用的文件仍然会被打包到产物中。
+
+如果你希望某些文件不被打包到产物中，可以使用以下方法：
+
+- **bundle 模式**：使用 Rspack 的 [IgnorePlugin](https://rspack.dev/zh/plugins/webpack/ignore-plugin)。
+- **bundleless 模式**：使用 `source.entry` 配置相应的 glob 表达式，参考 [设置入口](/config/lib/bundle#bundle-false)。
+
+:::
 
 ## source.include <RsbuildDocBadge path="/config/source/include" text="source.include" />