fix(retail): add region tag for JS- Update SearchwithPagination (GoogleCloudPlatform#4106)

* Update search-simple-query.js

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

* Update search-with-pagination.js

Author: rebeccaellis

retail/interactive-tutorials/search/search-simple-query.js

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// [START retail_search_simple_query]
 'use strict';
 
 async function main() {
@@ -76,3 +77,5 @@ process.on('unhandledRejection', err => {
 });
 
 main();
+
+// [END retail_search_simple_query]

retail/interactive-tutorials/search/search-with-pagination.js

@@ -14,6 +14,7 @@
 
 'use strict';
 
+// [START retail_search_for_products_with_pagination]
 async function main() {
   // Imports the Google Cloud client library.
   const {SearchServiceClient} = require('@google-cloud/retail');
@@ -83,6 +84,8 @@ async function main() {
   //PASTE CALL WITH NEXT PAGE TOKEN HERE:
 }
 
+// [END retail_search_for_products_with_pagination]
+
 process.on('unhandledRejection', err => {
   console.error(err.message);
   process.exitCode = 1;