chore: use python-samples-reviewers (#1316)

Author: busunkim96

synthtool/gcp/templates/python_library/.github/CODEOWNERS

@@ -8,12 +8,12 @@
 # @googleapis/yoshi-python {{ metadata['repo']['codeowner_team'] }} are the default owners for changes in this repo
 *     @googleapis/yoshi-python {{ metadata['repo']['codeowner_team'] }}
 
-# @googleapis/python-samples-owners {{ metadata['repo']['codeowner_team'] }} are the default owners for samples changes
-/samples/   @googleapis/python-samples-owners {{ metadata['repo']['codeowner_team'] }}
+# @googleapis/python-samples-reviewers {{ metadata['repo']['codeowner_team'] }} are the default owners for samples changes
+/samples/   @googleapis/python-samples-reviewers {{ metadata['repo']['codeowner_team'] }}
 {% else %}
 # @googleapis/yoshi-python is the default owner for changes in this repo
 *     @googleapis/yoshi-python
 
-# @googleapis/python-samples-owners is the default owner for samples changes
-/samples/   @googleapis/python-samples-owners
+# @googleapis/python-samples-reviewers is the default owner for samples changes
+/samples/   @googleapis/python-samples-reviewers
 {% endif -%}