📕 Parse.Cloud.onLiveQueryEvent not documented

[nangyal]

Link to section:
https://github.com/parse-community/parse-server/blob/master/src/cloud-code/Parse.Cloud.js#L290

What is the issue?
Parse.Cloud.onLiveQueryEvent not documented

Can you propose a solution?
https://stackoverflow.com/questions/43708317/detect-livequery-connected-clients-on-parse-server

[TomWFox]

Would you be willing to open a PR for this?