Update comment and add region tags (#540)
Update comment and add region tags (#540)

I want to use a docwidget in the docs to display the part of app.yaml that needs to be configured.
JustinBeckwith/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples