message: Updates documentation to include problems GraphQL for notifications
diff: @@ -199,6 +199,13 @@ mutation {
  # TODO: Fill in the notification field.
  # This is the notification name.
  notificationName: ""
  + # TODO: OPTIONAL
  + # The kind notification class you're interested in defaults to DEPLOYMENT
  + contentType: DEPLOYMENT/PROBLEM
  + # TODO: OPTIONAL
  + # Related to contentType PROBLEM, we can set the threshold for the kinds of problems
  + # we'd like to be notified about
  + notificationSeverityThreshold "NONE/UNKNOWN/NEGLIGIBLE/LOW/MEDIUM/HIGH/CRITICAL
  }
  ) {
  id
  