[zanata/zanata-platform] 2bce28: Update the webhook event names (#531)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zanata/zanata-platform
  Commit: 2bce2848b4d56d5a00c0a644c4aba1967d71b2da
      https://github.com/zanata/zanata-platform/commit/2bce2848b4d56d5a00c0a644c4aba1967d71b2da
  Author: bendem <online at bendem.be>
  Date:   2017-09-25 (Mon, 25 Sep 2017)

  Changed paths:
    M docs/user-guide/projects/project-settings.md

  Log Message:
  -----------
  Update the webhook event names (#531)

* Update the webhook event names
* Clarify where and how to trigger the webhooks manually