chore(endpoints): Update region tag (GoogleCloudPlatform#4020)

* chore(endpoints): Update region tag

* chore(endpoints): Modify the copyright year of the header to the date that it was created

---------

Co-authored-by: Jennifer Davis <sigje@google.com>

Author: hivanalejandro

endpoints/getting-started/openapi-appengine.yaml

@@ -1,3 +1,17 @@
+# Copyright 2017 Google LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START endpoints_swagger_appengine_yaml_nodejs]
 # [START swagger]
 swagger: "2.0"
 info:
@@ -6,6 +20,7 @@ info:
   version: "1.0.0"
 host: "YOUR-PROJECT-ID.appspot.com"
 # [END swagger]
+# [END endpoints_swagger_appengine_yaml_nodejs]
 consumes:
 - "application/json"
 produces: