Gateway: APNs topic is the watch app's bundle ID

gateway/src/apns.ts

@@ -9,7 +9,7 @@ export interface ApnsConfig {
   teamId: string;
   /** The .p8 key's PEM text. */
   key: string;
-  /** The app's bundle ID. */
+  /** The watch app's bundle ID, which is its APNs topic. */
   topic: string;
 }