Adding mobility to toc

Author: S-J-M

articles/azure-maps/toc.yml

@@ -146,6 +146,8 @@
       href: https://docs.microsoft.com/rest/api/maps/data
     - name: Geolocation service
       href: https://docs.microsoft.com/rest/api/maps/geolocation
+    - name: Mobility service
+      href: https://docs.microsoft.com/rest/api/maps/mobility
     - name: Render service
       href: https://docs.microsoft.com/rest/api/maps/render
     - name: Route service