docs: add hint for whether to enable dts.build (#1212)

Author: Timeless0911

packages/plugin-dts/README.md

@@ -104,6 +104,8 @@ pluginDts({
 
 Whether to generate declaration files with building the project references. This is equivalent to using the `--build` flag with the `tsc` command. See [Project References](https://www.typescriptlang.org/docs/handbook/project-references.html) for more details.
 
+When the project references are configured but the referenced project has not been built separately (for example, the source code of other projects is directly referenced in monorepo, but the corresponding declaration file is missing in the project), this option needs to be enabled to ensure that the declaration files of referenced projects can be generated correctly, thereby ensuring the integrity of the type system.
+
 When this option is enabled, you must explicitly set `declarationDir` or `outDir` in `tsconfig.json` in order to meet the build requirements.
 
 ### abortOnError

website/docs/en/config/lib/dts.mdx

@@ -161,6 +161,8 @@ export default {
 
 Whether to generate declaration files with building the project references. This is equivalent to using the `--build` flag with the `tsc` command. See [Project References](https://www.typescriptlang.org/docs/handbook/project-references.html) for more details.
 
+When the project references are configured but the referenced project has not been built separately (for example, the source code of other projects is directly referenced in monorepo, but the corresponding declaration file is missing in the project), this option needs to be enabled to ensure that the declaration files of referenced projects can be generated correctly, thereby ensuring the integrity of the type system.
+
 ::: note
 
 When this option is enabled, you must explicitly set `declarationDir` or `outDir` in `tsconfig.json` in order to meet the build requirements.

website/docs/zh/config/lib/dts.mdx

@@ -161,6 +161,8 @@ export default {
 
 是否在生成类型声明文件时构建项目的 project references。这相当于在 `tsc` 命令中使用 `--build` 标志。更多详细信息请参考 [项目引用](https://www.typescriptlang.org/docs/handbook/project-references.html)。
 
+在配置了 project references 但被引用的项目尚未单独构建时（例如在 monorepo 中直接引用其他项目的源代码，但项目中缺少对应的类型声明文件），需要开启此选项，以确保能够正确生成依赖项目的类型声明，从而保障类型系统的完整性。
+
 ::: note
 
 当启用此选项时，你必须在 `tsconfig.json` 中显式设置 `declarationDir` 或 `outDir` 以满足构建要求。