docs: update i18n docs sample to cater for latest raw-loader version (#…

…32334)

`raw-loader` version 2+ which is used in the CLI version 8 introduced a breaking change and now uses `export default` instead of `module.exports`.

See: https://github.com/webpack-contrib/raw-loader/blob/master/CHANGELOG.md#200-2019-03-18

Closes #32333

PR Close #32334

aio/content/examples/i18n/doc-files/main.2.ts

@@ -12,7 +12,7 @@ if (environment.production) {
 // use the require method provided by webpack
 declare const require;
 // we use the webpack raw-loader to return the content as a string
-const translations = require(`raw-loader!./locale/messages.fr.xlf`);
+const translations = require('raw-loader!./locale/messages.fr.xlf').default;
 
 platformBrowserDynamic().bootstrapModule(AppModule, {
   providers: [