Make docstrings consistent; add aliasing to make different event types clear (#692)
Make docstrings consistent; add aliasing to make different event types clear (#692)

* Make docstrings consistent; add aliasing

* Fix spacing issues, add `context` parameter to helloBackground

GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples