fix(retail): add region tag for Python - Changed region tag to retail_search_with_boost_spec (#13501)

* Update search_with_pagination.py

* Update search_with_boost_spec.py

Author: rebeccaellis

retail/interactive-tutorials/search/search_with_boost_spec.py

@@ -15,7 +15,7 @@
 # Call Retail API to search for a products in a catalog, rerank the
 # results boosting or burying the products that match defined condition.
 #
-# [START retail_search_product_with_boost_spec]
+# [START retail_search_with_boost_spec]
 
 import google.auth
 from google.cloud.retail import SearchRequest, SearchServiceClient
@@ -68,4 +68,4 @@ def search():
 
 
 search()
-# [END retail_search_product_with_boost_spec]
+# [END retail_search_with_boost_spec]