Add more comments to ForegroundNotification

Author: shiki

WooCommerce/Classes/ServiceLocator/ForegroundNotification.swift

@@ -6,7 +6,13 @@ import struct Yosemite.Note
 /// the app is active.
 ///
 struct ForegroundNotification {
+    /// The `note_id` value received from the Remote Notification's `userInfo`.
+    ///
     let noteID: Int
+    /// The `type` value received from the Remote Notification's `userInfo`.
+    ///
     let kind: Note.Kind
+    /// The `alert` value received from the Remote Notification's `userInfo`.
+    ///
     let message: String
 }