fix(retail): add region tag for node.js - Update write_user_event.js (GoogleCloudPlatform#4117)

* Update search-simple-query.js

Added region tag to simply search query for code snippet update in the documentation.

* Update search-with-pagination.js

* fix(retail): add region tag for node.js - Update write-user-event.js

* lint

---------

Co-authored-by: Katie McLaughlin <[email protected]>

Author: rebeccaellis

retail/interactive-tutorials/events/write-user-event.js

@@ -14,6 +14,7 @@
 
 'use strict';
 
+// [START retail_write_user_event]
 async function main() {
   // Imports the Google Cloud client library.
   const {UserEventServiceClient} = require('@google-cloud/retail').v2;
@@ -66,3 +67,4 @@ process.on('unhandledRejection', err => {
 });
 
 main();
+// [END retail_write_user_event]