docs: add a note about the scriptLangs config for TypeScript projects

To mitigate confusions about the restrictions such as described in vuejs/create-vue#663

templates/eslint.config.ts.ejs

@@ -7,6 +7,11 @@ import { defineConfigWithVueTs, vueTsConfigs } from '@vue/eslint-config-typescri
 <%- importer %>
 <%_ } _%>
 
+// To allow more languages other than `ts` in `.vue` files, uncomment the following lines:
+// import { configureVueProject } from '@vue/eslint-config-typescript'
+// configureVueProject({ scriptLangs: ['ts', 'tsx'] })
+// More info at https://github.com/vuejs/eslint-config-typescript/#advanced-setup
+
 export default defineConfigWithVueTs(
   {
     name: 'app/files-to-lint',