add push notification doc to TOC (#6208)

* add push notification doc to toc, removed by mistake

* fix links

Author: jwmsft

hub/apps/develop/toc.yml

@@ -393,6 +393,22 @@ items:
           href: notifications/push-notifications/push-quickstart.md
         - name: Troubleshooting
           href: notifications/push-notifications/troubleshooting.md
+        - name: Windows Push Notification Services (WNS) overview
+          href: notifications/push-notifications/wns-overview.md
+        - name: Quickstart Sending a push notification (XAML)
+          href: notifications/push-notifications/quickstart-send-push-notification.md
+        - name: WNS Priorities
+          href: notifications/push-notifications/wns-notification-priorities.md
+        - name: Allowlisting WNS Traffic
+          href: notifications/push-notifications/firewall-allowlist-config.md
+        - name: Code generated by the push notification wizard
+          href: notifications/push-notifications/code-generated-by-wizard.md
+        - name: How to request, create, and save a notification channel
+          href: notifications/push-notifications/request-create-save-notification-channel.md
+        - name: Push notification service request and response headers
+          href: notifications/push-notifications/push-request-response-headers.md
+        - name: Raw Notification Overview
+          href: notifications/push-notifications/raw-notification-overview.md
       - name: App notifications
         items:
         - name: Overview