Add comments to rulesnoozetype

x-pack/plugins/alerting/common/rule_snooze_type.ts

@@ -9,6 +9,8 @@ export type RuleSnooze = Array<{
   startTime: string;
   duration: number;
   timeZone: string;
+  // For scheduled/recurring snoozes, `id` uniquely identifies them so that they can be displayed, modified, and deleted individually
   id?: string;
+  // An iCal RRULE string to define a recurrence schedule, see https://github.com/jakubroztocil/rrule for the spec
   rRule?: string;
 }>;