fix: rootDir, not srdDir for public/_locales (#1751)

Author: mjfaga

docs/guide/essentials/i18n.md

@@ -22,7 +22,7 @@ This page discusses how to setup internationalization using the vanilla `browser
 
    <!-- prettier-ignore -->
    ```html
-   📂 {srcDir}/
+   📂 {rootDir}/
       📂 public/
          📂 _locales/
             📂 en/