Improve PushNotificationIOS documentation

Summary:
The documentation currently list a few but not all of the steps required. This changes completes that list of required project changes.

This addresses #5612
Closes #7985

Differential Revision: D3414576

Pulled By: nicklockwood

fbshipit-source-id: 2c7ea6598ee4cd8b6945d9bb229bed5b592a68f6

Libraries/PushNotificationIOS/PushNotificationIOS.js

@@ -36,9 +36,10 @@ const DEVICE_LOCAL_NOTIF_EVENT = 'localNotificationReceived';
  *
  * [Manually link](docs/linking-libraries-ios.html#manual-linking) the PushNotificationIOS library
  *
- * - Be sure to add the following to your `Header Search Paths`:
- * `$(SRCROOT)/../node_modules/react-native/Libraries/PushNotificationIOS`
- * - Set the search to `recursive`
+ * - Add the following to your Project: `node_modules/react-native/Libraries/PushNotificationIOS/RCTPushNotification.xcodeproj`
+ * - Add the following to `Link Binary With Libraries`: `libRCTPushNotification.a`
+ * - Add the following to your `Header Search Paths`:
+ * `$(SRCROOT)/../node_modules/react-native/Libraries/PushNotificationIOS` and set the search to `recursive`
  *
  * Finally, to enable support for `notification` and `register` events you need to augment your AppDelegate.
  *