docs: clarify how to set browserslist (#1057)

Author: Timeless0911

website/docs/en/guide/advanced/output-compatibility.mdx

@@ -7,12 +7,12 @@ This chapter introduces how to specify which target environment should be suppor
 
 ## Syntax downgrade
 
-By setting [lib.syntax](/config/lib/syntax), you can choose the syntax to which JavaScript and CSS will be downgraded. You can use the query syntax from [Browserslist](https://browsersl.ist/). Rslib also supports common ECMAScript version numbers, such as `ES2015`.
-
-Rslib also supports using a [.browserslistrc](https://github.com/browserslist/browserslist#config-file) file to specify settings. Note that [lib.syntax](/config/lib/syntax) takes precedence over `.browserslistrc`. If both are present, `lib.syntax` will be used.
+In Rslib, you can configure the syntax to which JavaScript and CSS will be downgraded by setting [lib.syntax](/config/lib/syntax). This configuration supports setting the ECMAScript version directly, such as `es2015`, `es2022`, etc., and also supports setting the query syntax of [Browserslist](https://browsersl.ist/), such as `last 2 versions`, `> 1%`, `node >= 16`, `chrome >= 80`, etc.
 
 By default, the syntax is set to `ESNext`, which will only supports only the latest version of mainstream browsers (Chrome / Firefox / Edge / macOS Safari / iOS Safari) or Node.js according to [output.target](/config/rsbuild/output#outputtarget).
 
+It should be noted that Rslib does not read the Browserslist related configuration files (such as `.browserslistrc` or the `browserslist` field in `package.json`). You can override by setting [output.overrideBrowserslist](/config/rsbuild/output#outputoverridebrowserslist) which has a higher priority than [lib.syntax](/config/lib/syntax).
+
 ## Polyfill
 
 Before dealing with compatibility issues, it is recommended that you understand the following background knowledge to better handle related issues. Check out the background knowledge on [syntax transpilation and API polyfill](https://rsbuild.rs/guide/advanced/browser-compatibility#syntax-downgrade-and-api-downgrade).

website/docs/zh/guide/advanced/output-compatibility.mdx

@@ -7,12 +7,12 @@ import { PackageManagerTabs } from '@theme';
 
 ## 语法降级
 
-通过设置 [lib.syntax](/config/lib/syntax)，你可以选择 JavaScript 和 CSS 将被降级到的语法。你可以使用 [Browserslist](https://browsersl.ist/) 的查询语法。Rslib 还支持常见的 ECMAScript 版本号，例如 `ES2015`。
-
-Rslib 还支持使用 [.browserslistrc](https://github.com/browserslist/browserslist#config-file) 文件来设置。需要注意的是，[lib.syntax](/config/lib/syntax) 优先于 `.browserslistrc`。如果两者都存在，将使用 `lib.syntax`。
+在 Rslib 中，你可以通过设置 [lib.syntax](/config/lib/syntax) 来选择 JavaScript 和 CSS 将被降级到的语法。该配置支持直接设置 ECMAScript 版本，例如 `es2015`、`es2022` 等，也支持设置 [Browserslist](https://browsersl.ist/) 的查询语法，例如 `last 2 versions`、`> 1%`、`node >= 16`、`chrome >= 80` 等。
 
 默认情况下，syntax 被设置为 `ESNext`，这代表将仅支持主流浏览器（Chrome / Firefox / Edge / macOS Safari / iOS Safari）或 Node.js 的最新版本，具体取决于 [output.target](/config/rsbuild/output#outputtarget)。
 
+需要注意的是，Rslib 不会读取 Browserslist 的相关配置文件（例如 `.browserslistrc` 或 `package.json` 中的 `browserslist` 字段）。你可以通过设置 [output.overrideBrowserslist](/config/rsbuild/output#outputoverridebrowserslist) 进行覆盖，该配置比 [lib.syntax](/config/lib/syntax) 拥有更高的优先级。
+
 ## Polyfill
 
 在处理兼容性问题之前，建议了解以下背景知识，以便更好地处理相关问题。请查看有关 [语法降级和 API 降级](https://rsbuild.rs/zh/guide/advanced/browser-compatibility#%E8%AF%AD%E6%B3%95%E9%99%8D%E7%BA%A7%E5%92%8C-api-%E9%99%8D%E7%BA%A7) 的背景知识。