chore (cloudrun): remove older region tags (GoogleCloudPlatform#3972)

Co-authored-by: Jennifer Davis <[email protected]>

Author: hivanalejandro

run/pubsub/Dockerfile

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 # [START cloudrun_pubsub_dockerfile_nodejs]
-# [START cloudrun_pubsub_dockerfile]
 
 # Use the official lightweight Node.js image.
 # https://hub.docker.com/_/node
@@ -42,5 +41,4 @@ COPY . .
 # Run the web service on container startup.
 CMD [ "npm", "start" ]
 
-# [END cloudrun_pubsub_dockerfile]
 # [END cloudrun_pubsub_dockerfile_nodejs]