docs: update global loading plugin references (#8331)

docs/src/en/guide/in-depth/loading.md

@@ -6,7 +6,7 @@ Global loading refers to the loading effect that appears when the page is refres
 
 ## Principle
 
-Implemented by the `vite-plugin-inject-app-loading` plugin, the plugin injects a global `loading html` into each application.
+The built-in `inject-app-loading` plugin implements this behavior. Its source is in `internal/vite-config/src/plugins/inject-app-loading`, and it injects global loading HTML into each application.
 
 ## Disable
 
@@ -20,6 +20,8 @@ VITE_INJECT_APP_LOADING=false
 
 If you want to customize the global loading, you can create a `loading.html` file in the application directory, at the same level as `index.html`. The plugin will automatically read and inject this HTML. You can define the style and animation of this HTML as you wish.
 
+The built-in default template is available at `internal/vite-config/src/plugins/inject-app-loading/default-loading.html` for reference.
+
 ::: tip
 
 - You can use the same syntax as in `index.html`, such as the `VITE_APP_TITLE` variable, to get the application's title.

docs/src/guide/in-depth/loading.md

@@ -6,7 +6,7 @@
 
 ## 原理
 
-由 `vite-plugin-inject-app-loading` 插件实现，插件会在每个应用都注入一个全局的 `loading html`。
+由项目内置的 `inject-app-loading` 插件实现。源码位于 `internal/vite-config/src/plugins/inject-app-loading`，插件会在每个应用中注入全局 `loading HTML`。
 
 ## 关闭
 
@@ -20,6 +20,8 @@ VITE_INJECT_APP_LOADING=false
 
 如果你想要自定义全局 loading，可以在应用目录下，与`index.html`同级，创建一个`loading.html`文件，插件会自动读取并注入。这个html可以自行定义样式和动画。
 
+项目内置的默认模板位于 `internal/vite-config/src/plugins/inject-app-loading/default-loading.html`，可作为自定义参考。
+
 ::: tip
 
 - 你可以使用跟`index.html`一样的语法，比如`VITE_APP_TITLE`变量，来获取应用的标题。